java - 我没有错误，但为什么我的应用程序一直关闭
问题描述
根据代码我没有问题但是为什么我的应用程序在运行时一直关闭我是java初学者我正在为我的论文制作一个测验应用程序我只复制youtube中的代码并编辑它请帮助我打开我的应用
MainActivity.java
package com.example.quizexam;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.Random;
public class MainActivity extends AppCompatActivity {
Button answer1, answer2, answer3;
TextView score, question;
private Question nQuestion = new Question();
private String nAnswer;
private int nScore = 0;
private int nQuestionsLength = nQuestion.nQuestions.length;
Random r;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
answer1 = (Button) findViewById(R.id.answer1);
answer2 = (Button) findViewById(R.id.answer2);
answer3 = (Button) findViewById(R.id.answer3);
score = (TextView) findViewById(R.id.score);
question = (TextView) findViewById(R.id.question);
updateQuestion(r.nextInt(nQuestionsLength));
answer1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(answer1.getText() == nAnswer){
nScore++;
score.setText("Score: " + nScore);
updateQuestion(r.nextInt(nQuestionsLength));
} else {
gameOver();
}
}
});
answer2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(answer2.getText() == nAnswer){
nScore++;
score.setText("Score: " + nScore);
updateQuestion(r.nextInt(nQuestionsLength));
} else {
gameOver();
}
}
});
answer3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(answer3.getText() == nAnswer){
nScore++;
score.setText("Score: " + nScore);
updateQuestion(r.nextInt(nQuestionsLength));
} else {
gameOver();
}
}
});
}
private void updateQuestion(int num) {
question.setText(nQuestion.getQuestion(num));
answer1.setText(nQuestion.getChoice1(num));
answer2.setText(nQuestion.getChoice2(num));
answer3.setText(nQuestion.getChoice3(num));
nAnswer = nQuestion.getCorrectAnswer(num);
}
private void gameOver(){
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);
alertDialogBuilder
.setMessage("Game Over! Your score is " + nScore + " points.")
.setCancelable(false)
.setPositiveButton("NEW GAME",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
startActivity(new Intent(getApplicationContext(),MainActivity.class));
}
})
.setNegativeButton("EXIT",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
finish();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="16dp"
android:paddingBottom="16dp"
android:paddingRight="16dp"
android:paddingLeft="16dp"
tools:context=".MainActivity">
<Button
android:id="@+id/answer3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="-24dp"
android:text="Button" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button"
android:layout_above="@+id/answer3"
android:layout_centerHorizontal="true"
android:id="@+id/answer2"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button"
android:layout_above="@+id/answer2"
android:layout_centerHorizontal="true"
android:id="@+id/answer1"/>
<TextView
android:text="TextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="24dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:id="@+id/score"/>
<TextView
android:text="TextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/score"
android:gravity="center"
android:textSize="24dp"
android:layout_centerHorizontal="true"
android:layout_above="@+id/answer1"
android:id="@+id/question"/>
</RelativeLayout>
问题.java
package com.example.quizexam;
public class Question {
public String nQuestions[] = {
"1.The three colors of the traffic lights are:",
"2.Yellow triangular signs provide what kind of information",
"3.Which of the following traffic signs are blue?",
"4.Steady green light means",
"5.A flashing yellow light at a road crossing signifies",
"6.A solid white line on the right edge of the highway slopes in towards your left. This shows that",
"7.\tYou are in a No-Passing zone when the center of the road is marked by",
};
private String nChoices[][] = {
{"red, green and yellow", "red, green and blue", "yellow, green and blue",},
{"warning", "hospital across", "speed limit"},
{"regulatory signs", "information signs", "danger warning signs"},
{"you must yield to all pedestrians and other motorists using the intersection", "go, it is safe to do so", "proceed cautiously through the intersection before the light changes to red."},
{"Caution - slow down and proceed with caution", "Stop and stay until light stops flashing", "Wait for the green light"},
{"there is an intersection joint ahead", "the road will get narrower", "you are approaching a construction area"},
{"a broken yellow line", "a broken white line", "two solid yellow lines"},};
private String nCorrectAnswers[] = {"red, green and yellow", "warning", "information signs", "go, it is safe to do so", "Caution - slow down and proceed with caution", "the road will get narrower", "two solid yellow lines"};
public String getQuestion(int a) {
String question = nQuestions[a];
return question;
}
public String getChoice1(int a) {
String choice = nChoices[a][0];
return choice;
}
public String getChoice2(int a) {
String choice = nChoices[a][1];
return choice;
}
public String getChoice3(int a) {
String choice = nChoices[a][2];
return choice;
}
public String getCorrectAnswer(int a) {
String answer = nCorrectAnswers[a];
return answer;
}
}
Logcat ps 未完成
03/08 11:14:07: Launching 'app' on vivo vivo 1811.
$ adb shell am start -n "com.example.quizexam/com.example.quizexam.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER -D
Waiting for application to come online: com.example.quizexam | com.example.quizexam.test
Waiting for application to come online: com.example.quizexam | com.example.quizexam.test
Connecting to com.example.quizexam
Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page.
W/ActivityThread: Application com.example.quizexam is waiting for the debugger on port 8100...
I/System.out: Sending WAIT chunk
I/zygote64: Debugger is active
I/System.out: Debugger has connected
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
Connected to the target VM, address: 'localhost:8604', transport: 'socket'
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: debugger has settled (1466)
I/FtBuild: getRomVersion mRomVer=4.5
D/PhoneWindow: DEBUG_ALIENSCREEN:getRotation mRotation=0
I/DecorView: setWindowBackground mBackgroundPadding = Rect(0, 0 - 0, 0), mFramePadding = Rect(0, 0 - 0, 0), pkg = com.example.quizexam
I/zygote64: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/View$OnUnhandledKeyEventListener;
I/zygote64: at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
at void androidx.appcompat.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
at java.lang.Object java.lang.reflect.Constructor.newInstance0(java.lang.Object[]) (Constructor.java:-2)
at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:334)
at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:656)
at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:835)
at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:775)
at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:908)
at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:869)
at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:521)
at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:429)
at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:380)
at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
at void com.example.quizexam.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:28)
at void android.app.Activity.performCreate(android.os.Bundle, android.os.PersistableBundle) (Activity.java:7166)
at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:7157)
at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1220)
at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2854)
at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2979)
at void android.app.ActivityThread.-wrap11(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1683)
at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:106)
at void android.os.Looper.loop() (Looper.java:192)
at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6754)
at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)
at void com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run() (RuntimeInit.java:549)
at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:828)
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.View$OnUnhandledKeyEventListener" on path: DexPathList[[zip file "/data/app/com.example.quizexam-WK3UcOpinvlhDThe14Llpw==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.quizexam-WK3UcOpinvlhDThe14Llpw==/lib/arm64, /system/lib64, /vendor/lib64]]
at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:125)
at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:379)
at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312)
at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
at void androidx.appcompat.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
at java.lang.Object java.lang.reflect.Constructor.newInstance0(java.lang.Object[]) (Constructor.java:-2)
at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:334)
at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:656)
at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:835)
at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:775)
at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:908)
at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:869)
at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:521)
at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:429)
at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:380)
at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
at void com.example.quizexam.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:28)
at void android.app.Activity.performCreate(android.os.Bundle, android.os.PersistableBundle) (Activity.java:7166)
at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:7157)
at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1220)
at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2854)
at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2979)
at void android.app.ActivityThread.-wrap11(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1683)
at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:106)
at void android.os.Looper.loop() (Looper.java:192)
at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6754)
at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)
at void com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run() (RuntimeInit.java:549)
at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:828)
I/zygote64: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/View$OnUnhandledKeyEventListener;
at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
at void androidx.appcompat.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
at java.lang.Object java.lang.reflect.Constructor.newInstance0(java.lang.Object[]) (Constructor.java:-2)
at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:334)
at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:656)
at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:835)
at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:775)
at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:908)
at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:869)
at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:521)
at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:429)
at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:380)
at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
at void com.example.quizexam.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:28)
at void android.app.Activity.performCreate(android.os.Bundle, android.os.PersistableBundle) (Activity.java:7166)
at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:7157)
at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1220)
at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2854)
at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2979)
at void android.app.ActivityThread.-wrap11(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1683)
at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:106)
at void android.os.Looper.loop() (Looper.java:192)
at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6754)
at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)
at void com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run() (RuntimeInit.java:549)
at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:828)
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.View$OnUnhandledKeyEventListener" on path: DexPathList[[zip file "/data/app/com.example.quizexam-WK3UcOpinvlhDThe14Llpw==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.quizexam-WK3UcOpinvlhDThe14Llpw==/lib/arm64, /system/lib64, /vendor/lib64]]
at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String)
我的错误
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.quizexam, PID: 24320
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.quizexam/com.example.quizexam.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.util.Random.nextInt(int)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2901)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2979)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1683)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:192)
at android.app.ActivityThread.main(ActivityThread.java:6754)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:828)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.util.Random.nextInt(int)' on a null object reference
at com.example.quizexam.MainActivity.onCreate(MainActivity.java:37)
at android.app.Activity.performCreate(Activity.java:7166)
at android.app.Activity.performCreate(Activity.java:7157)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2854)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2979)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1683)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:192)
at android.app.ActivityThread.main(ActivityThread.java:6754)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:828)
先感谢您
解决方案
那是因为您没有创建Random类实例
Random r = new Random();
这可能会解决错误，因为您的堆栈跟踪说错误是因为r变量为空
java.lang.NullPointerException：尝试调用虚拟方法“int java.util.Random.nextInt(int)”
推荐阅读
- r - 使用 ggplot 在坐标系外绘制数据点
- atom-editor - Atom 菜单栏标签不可见
- spring-boot - 与 MariaDB 的 Spring Boot/JPA 连接无法创建实体
- c# - ErrorMessageResourceType 通过方法设置
- amazon-web-services - 登录 AWS 胶水
- c# - C# Windows 窗体将 Date 类型的 DataGridView 单元格值传递给 DateTimePicker
- php - 在表单中发布表格
- reactjs - this.props、nextProp 和 nextState 的相同值会导致渲染错误
- list - 避免使用集合！进入函数式编程风格算法
- angularjs - 使用 AngularJS 发布和部署 Asp.net MVC