java - 在 Java 中使用两个数组进行计算
问题描述
我有这两个数组，我想用它们来显示最高和最低温度以及所有温度组合的平均值。对于整数，它应该显示最低温度，然后是最高温度。因此，对于数组中的每两个整数，另一个数组中的一年。根据所选年份，我将如何使其仅显示两个整数？yearTemp 在 ComboBox 中使用，并且 2 个整数将显示在不可编辑的文本框中。
/*
* Program Name: Temperature Average
* Author: Cody Tapp
* Date: July 12, 2018
* Class: CIT 149 Java I
* Description: This program will use temperature data from the past 65 years and use that info for the user to lookup
* high and low temperatures for the month of January and the year selected. Displayed will be the average temperature for that month from
* all the years combined.
*/
// Import gui components
import javax.swing.*;
import java.util.*;
import java.util.Comparator;
import javax.swing.ComboBoxModel;
import java.awt.*;
import java.awt.event.*;
public class TapCoGuiTempAverage extends JFrame
{ // Begin class
public static void main(String[] args)
{ // Begin main
new TapCoGuiTempAverage(); // Calls the TapCoGuiTempAverage method and executes.
} // End main
String[] yearTemp = new String[]
{ "1951", "1952", "1953", "1954",
"1955", "1956", "1957", "1958",
"1959", "1960", "1961", "1962",
"1963", "1964", "1965", "1966",
"1967", "1968", "1969", "1970",
"1971", "1972", "1973", "1974",
"1975", "1976", "1977", "1978",
"1979", "1980", "1981", "1982",
"1983", "1984", "1985", "1987",
"1988", "1989", "1990", "1991",
"1992", "1993", "1994", "1995",
"1996", "1997", "1998", "1999",
"2000", "2001", "2002", "2003",
"2004", "2005", "2006", "2007",
"2008", "2009", "2010", "2011",
"2012", "2013", "2014", "2015",
"2016"};
int[] highLowTemp = new int[]
{ 7, 68, 9, 77, 20, 65, -7, 63,
-3, 66, 8, 62, -2, 63, 3, 58,
-5, 69, 8, 70, -12, 58, -12, 71,
-28, 67, -6, 66, -14, 68, -15, 62,
10, 73, 0, 64, -12, 60, -14, 66,
7, 67, -8, 71, 0, 62, 13, 69,
6, 70, -3, 57, -13, 41, -6, 60,
0, 60, 15, 56, -2, 62, -19, 62,
11, 57, -2, 61, -16, 63, -7, 62,
-2, 61, 18, 67, 13, 68, 14, 62,
4, 58, 12, 67, -32, 54, 3, 69,
7, 68, -2, 68, 6, 66, 4, 73,
5, 69, 3, 61, 11, 72, -8, 57,
1, 70, 6, 69, 15, 65, 7, 67,
1, 70, 0, 60, 2, 57, 3, 62,
15, 64, 14, 68, -4, 57, 2, 59,
5, 64};
// Objects declared that will be used in GUI
private JButton buttonCalculate;
private JButton buttonExit;
private JComboBox<String> comboYearSelector = new JComboBox<>(yearTemp);
private JTextField textHighTemp;
private JTextField textLowTemp;
private JTextField textAverageHighTemp;
private JTextField textAverageLowTemp;
public TapCoGuiTempAverage() // Operate the GUI and processes all calculations based on selection in combobox
/** REMOVE VOID TYPE TO COMPILE. **/
{ // Begin method
// Sets window size, location, text, and close operation.
this.setSize(800, 400);
this.setLocation(400, 400);
this.setTitle("Daily Temperature");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
/**** REMOVE COMMENT, ONLY HERE TO COMPILE UNTIL INNER ACTIONLISTENER CLASS IS WRITTEN.****/
ButtonListener listen = new ButtonListener();
JPanel tempPanel = new JPanel(); // Creates panel so objects can be added to the window.
JLabel labelYear = new JLabel("Select the year");
tempPanel.add(labelYear);
tempPanel.setLayout(new GridLayout(15,6,0,5));
String[] yearSelection = yearTemp; // ComboBox has a string array that will be used to display options in the dropdown menu
comboYearSelector.addActionListener(listen); // ComboBox is added as an action listener and executes based on its selection.
tempPanel.add(comboYearSelector); // ComboBox button is added to the panel.
JLabel labelHighTemp = new JLabel("High Temp:");
tempPanel.add(labelHighTemp);
textHighTemp = new JTextField(5);
textHighTemp.setEditable(false);
tempPanel.add(textHighTemp);
JLabel labelLowTemp = new JLabel("Low Temp:");
tempPanel.add(labelLowTemp);
textLowTemp = new JTextField (5);
textLowTemp = new JTextField(6);
textLowTemp.setEditable(false);
tempPanel.add(textLowTemp);
JLabel labelAverageHighTemp = new JLabel("Average High:");
tempPanel.add(labelAverageHighTemp);
textAverageHighTemp = new JTextField(5);
textAverageHighTemp.setEditable(false);
tempPanel.add(textAverageHighTemp);
JLabel labelAverageLowTemp = new JLabel("Average Low:");
tempPanel.add(labelAverageLowTemp);
textAverageLowTemp = new JTextField(5);
textAverageLowTemp.setEditable(false);
tempPanel.add(textAverageLowTemp);
buttonCalculate = new JButton("Lookup Temp.");
buttonCalculate.addActionListener(listen);
buttonCalculate.setToolTipText("Looks up the temperature for year selected.");
tempPanel.add(buttonCalculate);
buttonExit = new JButton ("Exit");
buttonExit.addActionListener(listen);
buttonExit.setToolTipText("Closes the program.");
tempPanel.add(buttonExit);
this.add(tempPanel);
this.setVisible(true);
} // End method
private class ButtonListener implements ActionListener
{ // Begin inner class
public void actionPerformed (ActionEvent e)
{ // Begin method
if(e.getSource() == buttonCalculate)
{
String selectedItem = ((String)comboYearSelector.getSelectedItem());
// Get index of year array
for( int i = 0; i< yearTemp.length; i++)
{
if(yearTemp[i].equals(selectedItem))
{
int year = i;
int index = Arrays.binarySearch(yearTemp, year);
int lowTemp = highLowTemp[index*2];
int highTemp = highLowTemp[index*2+1];
String stringLowTemp = (Integer.toString(lowTemp));
String stringHighTemp = (Integer.toString(highTemp));
String displayLow = (String.format("%.2f", (stringLowTemp)));
String displayHigh = (String.format("%.2f", (stringHighTemp)));
textLowTemp.setText(displayLow);
textHighTemp.setText(displayHigh);
} // End inner if
} // End For Loop
} // End Outer If
else if (e.getSource().equals(buttonExit))
{
System.exit(0);
}
} // End method
} // End inner class
}// End class
解决方案
这是构建yearTemp阵列组合框的示例 GUI，并在选择年份时从阵列中检索相应的高温和低温highLowTemp。
import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class YearTempsTest {
private static final String [] yearTemp = new String [] {
"1951", "1952", "1953", "1954", "1955", "1956", "1957", "1958",
"1959", "1960", "1961", "1962", "1963", "1964", "1965", "1966",
"1967", "1968", "1969", "1970", "1971", "1972", "1973", "1974",
"1975", "1976", "1977", "1978", "1979", "1980", "1981", "1982",
"1983", "1984", "1985", "1987", "1988", "1989", "1990", "1991",
"1992", "1993", "1994", "1995", "1996", "1997", "1998", "1999",
"2000", "2001", "2002", "2003", "2004", "2005", "2006", "2007",
"2008", "2009", "2010", "2011", "2012", "2013", "2014", "2015",
"2016"};
private static final int [] highLowTemp = new int [] {
7, 68, 9, 77, 20, 65, -7, 63, -3, 66, 8, 62, -2, 63, 3, 58,
-5, 69, 8, 70, -12, 58, -12, 71, -28, 67, -6, 66, -14, 68, -15, 62,
10, 73, 0, 64, -12, 60, -14, 66, 7, 67, -8, 71, 0, 62, 13, 69,
6, 70, -3, 57, -13, 41, -6, 60, 0, 60, 15, 56, -2, 62, -19, 62,
11, 57, -2, 61, -16, 63, -7, 62, -2, 61, 18, 67, 13, 68, 14, 62,
4, 58, 12, 67, -32, 54, 3, 69, 7, 68, -2, 68, 6, 66, 4, 73,
5, 69, 3, 61, 11, 72, -8, 57, 1, 70, 6, 69, 15, 65, 7, 67,
1, 70, 0, 60, 2, 57, 3, 62, 15, 64, 14, 68, -4, 57, 2, 59,
5, 64};
public static void main (String [] args) {
new YearTempsTest().buildGui();
}
private void buildGui () {
JFrame dialog = new JFrame("Year & temps");
JComboBox<String> yearCombo = new JComboBox<>(yearTemp);
yearCombo.addItemListener(new YearItemListener());
dialog.add(yearCombo);
dialog.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
dialog.setLocation(300, 200);
dialog.setSize(300, 100);
dialog.setVisible(true);
}
private class YearItemListener implements ItemListener {
@Override public void itemStateChanged(ItemEvent e) {
if (e.getStateChange() == ItemEvent.SELECTED) {
String year = (String) e.getItem();
// get index of year array
int ix = Arrays.binarySearch(yearTemp, year, Comparator.naturalOrder());
// get the high low temps using year array index
int lowTemp = highLowTemp [ix*2];
int highTemp = highLowTemp [ix*2 + 1];
// work with the two temp values (show in a text field, etc.)
System.out.println(year + " -> " + lowTemp + " :: " + highTemp);
}
}
}
}
编辑：请注意，假设yearTemp数组的元素已排序（看起来已经如此）。这是binarySearch正常工作所必需的。
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