问题

英文:

I am trying to print a string onto JLabel, [ [1,0,1]
[0,1,1] ] (Java)
d-color:#272822;">import java.util.*; style="color:#f92672">import javax.swing.*; style="color:#f92672">import javax.swing.JLabel; style="color:#66d9ef">public class ProjectFrame extends javax.swing.JFrame { /** style="color:#75715e"> * Creates new form ProjectFrame style="color:#75715e"> */ public ProjectFrame() { initComponents(); } /** style="color:#75715e"> * This method is called from within the constructor to initialize the form. style="color:#75715e"> * WARNING: Do NOT modify this code. The content of this method is always style="color:#75715e"> * regenerated by the Form Editor. style="color:#75715e"> */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> style="color:#75715e"> 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> style="color:#75715e"> /** style="color:#75715e"> * @param args the command line arguments style="color:#75715e"> */ public static void main(String args[]) { /* Set the Nimbus look and feel */ //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> style="color:#75715e"> /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. style="color:#75715e"> * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html style="color:#75715e"> */ 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> style="color:#75715e"> /* 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 style="color:#75715e"> 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]); style="color:#75715e"> } //System.out.println(); style="color:#75715e"> } 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 style="color:#75715e"> private javax.swing.JLabel jLabel1; // End of variables declaration style="color:#75715e">} the output should look like on the JLabel


I have tried but I cant seem to get this to work.. Please look at the end of the code to see the relevant src code..
My source code:
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(&quot;unchecked&quot;)
// &lt;editor-fold defaultstate=&quot;collapsed&quot; desc=&quot;Generated Code&quot;&gt;                          
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();
}// &lt;/editor-fold&gt;                        
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//&lt;editor-fold defaultstate=&quot;collapsed&quot; desc=&quot; Look and feel setting code (optional) &quot;&gt;
/* 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 (&quot;Nimbus&quot;.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);
}
//&lt;/editor-fold&gt;
/* 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 &lt; 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 &lt; 2; x++) {
for (int j = 0; j &lt; 3; j++) {
//System.out.printf(&quot;%5d &quot;, 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+&quot;\n&quot;+secondHalf);
}
// Variables declaration - do not modify                     
private javax.swing.JLabel jLabel1;
// End of variables declaration                   
}


答案1
得分: 0
在arrayGen()函数中创建了一个新的Label，这就是问题所在。
我已经修改了代码。
import java.util.*;
import javax.swing.*;
import javax.swing.JLabel;

public class ProjectFrame extends javax.swing.JFrame {

    public ProjectFrame() {
        initComponents();
    }

    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();
    }

    public static void main(String args[]) {
        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);
        }

        ProjectFrame f = new ProjectFrame();
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                f.setVisible(true);
            }
        });
        f.arrayGen();
    }

    public void arrayGen() {

        int[][] ranArr = new int[2][3];

        for(int i = 0; i < 4; i++) {
            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;
        }

        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;

        jLabel1.setText(firstHalf+"\n"+secondHalf);
    }

    private javax.swing.JLabel jLabel1;
}


英文:
You created a new Lable in arrayGen() thats the problem.
I have modified the code.
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(&quot;unchecked&quot;)
// &lt;editor-fold defaultstate=&quot;collapsed&quot; desc=&quot;Generated Code&quot;&gt;                          
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();
}// &lt;/editor-fold&gt;                        
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//&lt;editor-fold defaultstate=&quot;collapsed&quot; desc=&quot; Look and feel setting code (optional) &quot;&gt;
/* 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 (&quot;Nimbus&quot;.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);
}
//&lt;/editor-fold&gt;
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 &lt; 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 &lt; 2; x++) {
for (int j = 0; j &lt; 3; j++) {
//System.out.printf(&quot;%5d &quot;, 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+&quot;\n&quot;+secondHalf);
}
// Variables declaration - do not modify                     
private javax.swing.JLabel jLabel1;
// End of variables declaration                   

}







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