java - ArrayList 中的 ArrayList 项重复
问题描述
我正在制作一个存储每个产品的产品(ArrayList)和产品项(ArrayList)的 GUI。但是,当我保存时,Arraylist 项已更改,并且最近保存的项在整个 ArrayList 中重复出现。
我希望输出是(第二次保存):
[[1, TEST1, TEST1, TEST1, TEST1, TEST1, 2021-02-27], [2, TEST2, TEST2, TEST2, TEST2, TEST2, 2021-02-27]]
但它是:
[[2, TEST2, TEST2, TEST2, TEST2, TEST2, 2021-02-27], [2, TEST2, TEST2, TEST2, TEST2, TEST2, 2021-02-27]]
有什么我想念的吗?任何帮助,将不胜感激。
我的代码:
package prog2exer1;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.table.DefaultTableModel;
import java.util.ArrayList;
public class Products extends javax.swing.JFrame {
Date currentDate = new Date();
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
String strDate = dateFormat.format(currentDate);
ArrayList<ArrayList<String>> contentItems = new ArrayList();
ArrayList<String> contents = new ArrayList();
int id = 1;
public Products() {
initComponents();
dateReceieved.setText(strDate);
pID.setText(Integer.toString(id));
DefaultTableModel tblmodel = (DefaultTableModel) products.getModel();
tblmodel.setRowCount(0);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
jLabel7 = new javax.swing.JLabel();
jLabel8 = new javax.swing.JLabel();
pID = new javax.swing.JTextField();
pType = new javax.swing.JTextField();
pDesc = new javax.swing.JTextField();
pSupplier = new javax.swing.JTextField();
quantityTrue = new javax.swing.JTextField();
pCost = new javax.swing.JTextField();
dateReceieved = new javax.swing.JTextField();
jLabel9 = new javax.swing.JLabel();
plusSign = new javax.swing.JLabel();
quantityAdd = new javax.swing.JTextField();
jPanel1 = new javax.swing.JPanel();
jScrollPane1 = new javax.swing.JScrollPane();
products = new javax.swing.JTable();
jPanel2 = new javax.swing.JPanel();
jScrollPane2 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
newProduct = new javax.swing.JButton();
stockIn = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("Product ID");
jLabel2.setText("Product Type");
jLabel3.setText("Product Description");
jLabel4.setText("Supplier");
jLabel6.setText("Quantity");
jLabel7.setText("Total Cost");
jLabel8.setText("Date Received");
pID.setEditable(false);
dateReceieved.setEditable(false);
jLabel9.setFont(new java.awt.Font("Dialog", 1, 18)); // NOI18N
jLabel9.setText("New Products Stock-in");
plusSign.setText("+");
products.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null}
},
new String [] {
"ID", "pType", "pDesc", "Supplier", "Total Quantity", "Orders"
}
));
products.setCellSelectionEnabled(true);
products.setFocusTraversalPolicyProvider(true);
products.setName(""); // NOI18N
jScrollPane1.setViewportView(products);
products.getColumnModel().getSelectionModel().setSelectionMode(javax.swing.ListSelectionModel.SINGLE_INTERVAL_SELECTION);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 735, Short.MAX_VALUE)
.addContainerGap())
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 228, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(193, 193, 193))
);
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null, null, null, null, null},
{null, null, null, null, null, null, null, null},
{null, null, null, null, null, null, null, null},
{null, null, null, null, null, null, null, null}
},
new String [] {
"ID", "PType", "PDesc", "Supplier", "Quantity", "Cost", "Date Received", "Orders"
}
));
jScrollPane2.setViewportView(jTable1);
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 721, Short.MAX_VALUE)
.addContainerGap())
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 411, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(16, Short.MAX_VALUE))
);
newProduct.setText("New Product");
newProduct.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
newProductActionPerformed(evt);
}
});
stockIn.setText("Stock In");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(27, 27, 27)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel6)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(quantityTrue, javax.swing.GroupLayout.PREFERRED_SIZE, 82, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(plusSign, javax.swing.GroupLayout.PREFERRED_SIZE, 17, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(quantityAdd))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(pDesc, javax.swing.GroupLayout.PREFERRED_SIZE, 124, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addComponent(jLabel7)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(pCost))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addComponent(jLabel4)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(pSupplier, javax.swing.GroupLayout.PREFERRED_SIZE, 119, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(pType))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(pID, javax.swing.GroupLayout.PREFERRED_SIZE, 138, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addComponent(jLabel8)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(dateReceieved)))
.addComponent(stockIn)
.addComponent(newProduct))
.addGap(0, 0, Short.MAX_VALUE))))
.addGroup(layout.createSequentialGroup()
.addGap(83, 83, 83)
.addComponent(jLabel9)))
.addGap(118, 118, 118)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addGap(6, 6, 6)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(50, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(36, 36, 36)
.addComponent(jLabel9)
.addGap(30, 30, 30)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(pID, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(pType))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(pDesc))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel4)
.addComponent(pSupplier))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel6)
.addComponent(quantityTrue)
.addComponent(plusSign, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(quantityAdd))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel7)
.addComponent(pCost))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel8)
.addComponent(dateReceieved))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(newProduct)
.addGap(4, 4, 4)
.addComponent(stockIn)
.addGap(560, 560, 560))
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 240, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
);
pack();
}// </editor-fold>
private void newProductActionPerformed(java.awt.event.ActionEvent evt) {
DefaultTableModel tblmodel = (DefaultTableModel) products.getModel();
contents.clear();
contents.add(pID.getText());
contents.add(pType.getText());
contents.add(pDesc.getText());
contents.add(pSupplier.getText());
contents.add(quantityTrue.getText());
contents.add(pCost.getText());
contents.add(strDate);
contentItems.add(contents);
System.out.println(contents);
System.out.println(contentItems);
pID.setText(Integer.toString(id));
id++;
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new Products().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextField dateReceieved;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JLabel jLabel9;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTable jTable1;
private javax.swing.JButton newProduct;
private javax.swing.JTextField pCost;
private javax.swing.JTextField pDesc;
private javax.swing.JTextField pID;
private javax.swing.JTextField pSupplier;
private javax.swing.JTextField pType;
private javax.swing.JLabel plusSign;
private javax.swing.JTable products;
private javax.swing.JTextField quantityAdd;
private javax.swing.JTextField quantityTrue;
private javax.swing.JButton stockIn;
// End of variables declaration
}
解决方案
而不是清除 newProductActionPerformed 中的内容,而是创建新的内容列表:
private void newProductActionPerformed(java.awt.event.ActionEvent evt) {
DefaultTableModel tblmodel = (DefaultTableModel) products.getModel();
contents.clear(); // wrong, you are using same content object...
contents = new ArrayList();// create new object for each content
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