我正在上12年级编程的在线课程，并且我们在Net Bean中使用Java应用程序。我们需要创建一个程序，以显示输入的学生4个测试成绩，最多15个学生。
我已经设置好了这样的数组
private void addButtonActionPerformed(java.awt.event.ActionEvent evt) {
String testOne = test1Input.getText();
String testTwo = test2Input.getText();
String testThree = test3Input.getText();
String testFour = test4Input.getText();
String studentNames = (firstInput.getText() + " " + secondInput.getText());
students[next][0] = studentNames;
students[next][1] = testOne;
students[next][2] = testTwo;
students[next][3] = testThree;
students[next][4] = testFour;
next++;
}
当我使用显示它时
private void listButoonActionPerformed(java.awt.event.ActionEvent evt) {
for (int row = 0; row <= 15; row++) {
for (int col = 0; col <= 4; col++) {
outBox.setText(students[row][col] + " ");
}
}
}
它仅显示第三个测试标记
/ * *要更改此许可证标题，请在“项目属性”中选择“许可证标题”。 *要更改此模板文件，请选择工具|范本 *并在编辑器中打开模板。 * / 打包studentGrades;
/ ** * * @作者stuba * / 公共类UI扩展了javax.swing.JFrame {
public static String[][] students = new String[15][4];
public static int next = 0;
/**
* Creates new form UI
*/
public UI() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
title = new javax.swing.JLabel();
firstLabel = new javax.swing.JLabel();
secondLabel = new javax.swing.JLabel();
firstInput = new javax.swing.JTextField();
secondInput = new javax.swing.JTextField();
test1 = new javax.swing.JLabel();
test2 = new javax.swing.JLabel();
test3 = new javax.swing.JLabel();
test4 = new javax.swing.JLabel();
test1Input = new javax.swing.JTextField();
test2Input = new javax.swing.JTextField();
test3Input = new javax.swing.JTextField();
test4Input = new javax.swing.JTextField();
addButton = new javax.swing.JButton();
listButton = new javax.swing.JButton();
stundentAvButton = new javax.swing.JButton();
courseAvButton = new javax.swing.JButton();
exit = new javax.swing.JButton();
jScrollPane1 = new javax.swing.JScrollPane();
outBox = new javax.swing.JTextPane();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBackground(new java.awt.Color(51, 51, 51));
title.setFont(new java.awt.Font("Tahoma", 1, 14)); // NOI18N
title.setForeground(new java.awt.Color(153, 255, 204));
title.setText("Student Grades");
firstLabel.setForeground(new java.awt.Color(153, 255, 204));
firstLabel.setText("First Name:");
secondLabel.setForeground(new java.awt.Color(153, 255, 204));
secondLabel.setText("Last Name:");
firstInput.setBackground(new java.awt.Color(204, 204, 204));
secondInput.setBackground(new java.awt.Color(204, 204, 204));
test1.setForeground(new java.awt.Color(153, 255, 204));
test1.setText("Test 1");
test2.setForeground(new java.awt.Color(153, 255, 204));
test2.setText("Test 2");
test3.setForeground(new java.awt.Color(153, 255, 204));
test3.setText("Test 3");
test4.setForeground(new java.awt.Color(153, 255, 204));
test4.setText("Test 4");
test1Input.setBackground(new java.awt.Color(204, 204, 204));
test2Input.setBackground(new java.awt.Color(204, 204, 204));
test3Input.setBackground(new java.awt.Color(204, 204, 204));
test4Input.setBackground(new java.awt.Color(204, 204, 204));
addButton.setBackground(new java.awt.Color(153, 153, 153));
addButton.setForeground(new java.awt.Color(153, 255, 204));
addButton.setText("Add");
addButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
addButtonActionPerformed(evt);
}
});
listButton.setBackground(new java.awt.Color(153, 153, 153));
listButton.setForeground(new java.awt.Color(153, 255, 204));
listButton.setText("List");
listButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
listButtonActionPerformed(evt);
}
});
stundentAvButton.setBackground(new java.awt.Color(153, 153, 153));
stundentAvButton.setForeground(new java.awt.Color(153, 255, 204));
stundentAvButton.setText("Student Average");
courseAvButton.setBackground(new java.awt.Color(153, 153, 153));
courseAvButton.setForeground(new java.awt.Color(153, 255, 204));
courseAvButton.setText("Course Average");
exit.setBackground(new java.awt.Color(153, 153, 153));
exit.setForeground(new java.awt.Color(153, 255, 204));
exit.setText("Exit");
exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
exitActionPerformed(evt);
}
});
jScrollPane1.setViewportView(outBox);
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()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(test3)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(firstLabel)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(firstInput, javax.swing.GroupLayout.PREFERRED_SIZE, 95, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(test1)
.addGap(18, 18, 18)
.addComponent(test1Input, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(18, 18, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(listButton)
.addGap(18, 18, 18)
.addComponent(courseAvButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(addButton)
.addGap(18, 18, 18)
.addComponent(stundentAvButton))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(10, 10, 10)
.addComponent(secondLabel)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(secondInput, javax.swing.GroupLayout.PREFERRED_SIZE, 95, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(title)
.addGap(99, 99, 99))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(test3Input, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(test2)
.addGap(18, 18, 18)
.addComponent(test2Input, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(test4)
.addGap(18, 18, 18)
.addComponent(test4Input, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(10, 10, 10)
.addComponent(jScrollPane1)))
.addGap(52, 52, 52))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(exit))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(title)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(firstLabel)
.addComponent(secondLabel)
.addComponent(firstInput, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(secondInput, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(test1)
.addComponent(addButton)
.addComponent(stundentAvButton)
.addComponent(test1Input, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(test2)
.addComponent(test2Input, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(test3)
.addComponent(listButton)
.addComponent(courseAvButton)
.addComponent(test3Input, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(test4)
.addComponent(test4Input, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 103, Short.MAX_VALUE)
.addComponent(exit))
.addComponent(jScrollPane1)))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void addButtonActionPerformed(java.awt.event.ActionEvent evt) {
String studentNames = (firstInput.getText() + secondInput.getText());
students[next][0] = studentNames;
students[next][1] = test1Input.getText();
students[next][2] = test2Input.getText();
students[next][3] = test3Input.getText();
students[next][4] = test4Input.getText();
next++;
}
private void listButtonActionPerformed(java.awt.event.ActionEvent evt) {
StringBuilder sb = new StringBuilder();
for (int row = 0; row <= 15; row++) {
for (int col = 0; col <= 4; col++) {
sb.append(students[row][col] + " ");
}
sb.append(System.lineSeparator());
}
outBox.setText(sb.toString());
}
private void exitActionPerformed(java.awt.event.ActionEvent evt) {
System.exit(0);
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(UI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(UI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(UI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(UI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new UI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton addButton;
private javax.swing.JButton courseAvButton;
private javax.swing.JButton exit;
private javax.swing.JTextField firstInput;
private javax.swing.JLabel firstLabel;
private javax.swing.JPanel jPanel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JButton listButton;
private javax.swing.JTextPane outBox;
private javax.swing.JTextField secondInput;
private javax.swing.JLabel secondLabel;
private javax.swing.JButton stundentAvButton;
private javax.swing.JLabel test1;
private javax.swing.JTextField test1Input;
private javax.swing.JLabel test2;
private javax.swing.JTextField test2Input;
private javax.swing.JLabel test3;
private javax.swing.JTextField test3Input;
private javax.swing.JLabel test4;
private javax.swing.JTextField test4Input;
private javax.swing.JLabel title;
// End of variables declaration
}
答案 0 :(得分：2)
您将继续覆盖输出框中的文本。一种更好的方法是将文本堆积在StringBuilder中，然后将其设置到输出框中：
private void listButoonActionPerformed(java.awt.event.ActionEvent evt) {
StringBuilder sb = new StringBuilder();
for (int row = 0; row <= 15; row++) {
for (int col = 0; col <= 4; col++) {
sb.append(students[row][col]).append(" ");
}
sb.append(System.lineSeparator());
}
outBox.setText(sb.toString());
}