import java.awt.Color; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JTextField; //调用 public class kc {//主函数 javax.swing.JFrame jf = new javax.swing.JFrame();//创建窗体 public static void main(String[] args) { kc lo = new kc(); lo.showUI();//显示UI } public class ButListener implements ActionListener { private JTextField jt; public void setJt(JTextField jt) { this.jt = jt; } public void actionPerformed(ActionEvent e) { jt.setText("joyer520"); } }//“打印”按钮的回应 public class ButListener2 implements ActionListener {//“关闭”按钮的回应 public void actionPerformed(ActionEvent e) { System.exit(0); } } public void showUI() { jf.setTitle("kc"); jf.setSize(300, 400); jf.setLocationRelativeTo(null); jf.setLayout(null); jf.setResizable(false); jf.setUndecorated(true);//设置窗体 javax.swing.JButton jbu = new javax.swing.JButton(" 打印"); jbu.setBounds(30, 30, 70, 25); jbu.setBackground(Color.BLACK); jbu.setForeground(Color.white); jbu.setFocusPainted(false); jf.add(jbu);//设置按钮 javax.swing.JButton jbu2 = new javax.swing.JButton("退出"); jbu2.setBounds(30, 130, 70, 25); jbu2.setBackground(Color.BLACK); jbu2.setForeground(Color.white); jbu2.setFocusPainted(false); jf.add(jbu2);//设置按钮 javax.swing.JTextField jtf = new javax.swing.JTextField(); java.awt.Dimension dm = new java.awt.Dimension(280, 30); jtf.setPreferredSize(dm); jtf.setBounds(30, 150, 150, 25); jf.add(jtf);//设置文本框 ButListener but = new ButListener(); jbu.addActionListener(but); ButListener2 but2 = new ButListener2(); jbu2.addActionListener(but2);//类似C++的信号槽 but.setJt(jtf);//“打印”与文本框建立联系 jf.setVisible(true);//可以显示 } }