我正在尝试在JLabel上打印字符串，输出应类似于JLabel [[1,0,1] [0,1,1]]
我已经尝试过，但似乎无法正常工作。.请查看代码结尾以查看相关的src代码。
我的源代码：
import java.util.*;
import javax.swing.*;
import javax.swing.JLabel;
public class ProjectFrame extends javax.swing.JFrame {
/**
* Creates new form ProjectFrame
*/
public ProjectFrame() {
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() {
jLabel1 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(101, 101, 101)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 180, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(119, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(76, 76, 76)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 125, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(99, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
/**
* @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(ProjectFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ProjectFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ProjectFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ProjectFrame.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 ProjectFrame().setVisible(true);
}
});
arrayGen();
}
public static void arrayGen() {
int[][] ranArr = new int[2][3];
for(int i = 0; i < 4; i++) {
//Get random values b/w 0-2
Random r = new Random();
int posOne = r.nextInt(2);
int posTwo = r.nextInt(3);
while (ranArr[posOne][posTwo] == 1) {
posOne = r.nextInt(2);
posTwo = r.nextInt(3);
}
ranArr[posOne][posTwo] = 1;
}
for (int x = 0; x < 2; x++) {
for (int j = 0; j < 3; j++) {
//System.out.printf("%5d ", ranArr[x][j]);
}
//System.out.println();
}
String twoD = Arrays.deepToString(ranArr);
int mid = twoD.length()/2;
String firstHalf = twoD.substring(0,mid-1);
String secondHalf = twoD.substring(mid);
String firstSecond = firstHalf + secondHalf;
JLabel jLabel1 = new JLabel();
jLabel1.setText(firstHalf+"\n"+secondHalf);
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
// End of variables declaration
}
答案 0 :(得分：0)
您在arrayGen（）中创建了一个新标签，这就是问题所在。
我修改了代码。
import java.util.*;
import javax.swing.*;
import javax.swing.JLabel;
public class ProjectFrame extends javax.swing.JFrame {
/**
* Creates new form ProjectFrame
*/
public ProjectFrame() {
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() {
jLabel1 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(101, 101, 101)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 180, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(119, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(76, 76, 76)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 125, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(99, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
/**
* @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(ProjectFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ProjectFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ProjectFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ProjectFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
ProjectFrame f = new ProjectFrame();
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
//new ProjectFrame().setVisible(true);
f.setVisible(true);
}
});
f.arrayGen();
}
public void arrayGen() {
int[][] ranArr = new int[2][3];
for(int i = 0; i < 4; i++) {
//Get random values b/w 0-2
Random r = new Random();
int posOne = r.nextInt(2);
int posTwo = r.nextInt(3);
while (ranArr[posOne][posTwo] == 1) {
posOne = r.nextInt(2);
posTwo = r.nextInt(3);
}
ranArr[posOne][posTwo] = 1;
}
for (int x = 0; x < 2; x++) {
for (int j = 0; j < 3; j++) {
//System.out.printf("%5d ", ranArr[x][j]);
}
//System.out.println();
}
String twoD = Arrays.deepToString(ranArr);
int mid = twoD.length()/2;
String firstHalf = twoD.substring(0,mid-1);
String secondHalf = twoD.substring(mid);
String firstSecond = firstHalf + secondHalf;
// JLabel jLabel1 = new JLabel();
jLabel1.setText(firstHalf+"\n"+secondHalf);
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
// End of variables declaration
}