如何影响另一个线程?(例如:设置选择复选框)

Question

我用netbeans创建了两个"jFrame表单"。我可以同时打开这两个。这些代码运行，但没有效果。我尝试设置在窗体2中用窗体1中的按钮选择复选框。不知怎么的，我无法影响其他线程。你能帮我修一下吗？谢谢。（对不起，我英语不好，我也在学英语）

这是form1.java（我删除了一些自动代码）

package test;
import javax.swing.SwingUtilities;
public class form1 extends javax.swing.JFrame {
public form1() {
    initComponents();
}                                      
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
  new form2().setVisible(true);
}                                        
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            final form2 click = new form2();
            SwingUtilities.invokeLater(
            new Runnable() {
            public void run() {
            click.jCheckBox1.setSelected(true);
        }
    }
    );
}                                        
public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
    public void run() {
    new form1().setVisible(true);
    }
    });
}  
// Variables declaration - do not modify                     
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
// End of variables declaration                  
}

这是form2.java（我删除了一些自动代码）

package test;
public class form2 extends javax.swing.JFrame {
public form2() {
    initComponents();
}                 
public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new form2().setVisible(true);
        }
    });
}  
// Variables declaration - do not modify                     
public javax.swing.JCheckBox jCheckBox1;
// End of variables declaration                
}

Answer 1

在jButton2ActionPerformed方法中，您正在创建一个从未显示的新JFrame。您不是在操纵jButton1ActionPerformed中显示的JFrame。

试试这个：

package test;
import javax.swing.SwingUtilities;
public class form1 extends javax.swing.JFrame {
private form2 click = null; // this will hold the second JFrame (the one with the checkbox)
public form1() {
    initComponents();
}                                      
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
  if (click == null) { // only create the second JFrame once
      click = new form2(); // this stores the second JFrame with the name "click"
      click.setVisible(true);
  }
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            SwingUtilities.invokeLater(
            new Runnable() {
            public void run() {
                if (click != null) { // don't do anything if the second JFrame isn't displayed yet
                    click.jCheckBox1.setSelected(true);
                }
            }
        }
    );
}                                        
public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
    public void run() {
    new form1().setVisible(true);
    }
    });
}  
// Variables declaration - do not modify                     
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
// End of variables declaration                  
}

顺便说一句，类名以小写字母开头是一种糟糕的形式，非常令人困惑。将form1重命名为Form1，将form2重命名为Form2。