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你好，在构造方法FrameOut()中调用setLayout()方法加入一种控件布局形式，例如加入setLayout(new FlowLayout());即可以流布局的形式显示控件。
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完整代码如下：
import java.awt.*;
import java.awt.event.*;
public class ApplicationInOut{
public static void main(String args[ ]){
new FrameInOut();
}
}
class FrameInOut extends Frame implements ActionListener{
Label prompt;
TextField input,output;
FrameInOut( ){
super("图形界面的Java Application程序");
prompt=new Label("Java 是面向对象的语言吗？");
input=new TextField(6);
output=new TextField(20);
add(prompt);
add(input);
add(output);
input.addActionListener(this);
setLayout(new FlowLayout()); //此处即为添加布局形式
setSize(800,600);
setVisible(true); //show( );
}
public void actionPerformed(ActionEvent e){
output.setText(input.getText()+"OK!");
}
}
把frame=new subJFrame("DrawShapes");改成frame=new JFrame("DrawShapes");
程序基本没问题，在public void paint(Graphics g)中加上如下程序就可以了。
public void paint(Graphics g){
switch(i){
case 1: g.drawOval(20,20,40,40);break;
case 2: g.drawRect(20,20,40,40);break;
case 3: g.drawOval(20,30,40,50);break;
case 4: g.drawLine(20,20,40,40);break;
}
}
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class Login {
private JFrame frame = new JFrame("登录");
private Container c = frame.getContentPane();
private JTextField username = new JTextField();
private JPasswordField password = new JPasswordField();
private JButton ok = new JButton("确定");
private JButton cancel = new JButton("取消");
public Login(){
frame.setSize(300,200);
c.setLayout(new BorderLayout());
initFrame();
frame.setVisible(true);
}
private void initFrame() {
//顶部
JPanel titlePanel = new JPanel();
titlePanel.setLayout(new FlowLayout());
titlePanel.add(new JLabel("系统管理员登录"));
c.add(titlePanel,"North");
//中部表单
JPanel fieldPanel = new JPanel();
fieldPanel.setLayout(null);
JLabel l1 = new JLabel("用户名:");
l1.setBounds(50, 20, 50, 20);
JLabel l2 = new JLabel("密 码:");
l2.setBounds(50, 60, 50, 20);
fieldPanel.add(l1);
fieldPanel.add(l2);
username.setBounds(110,20,120,20);
password.setBounds(110,60,120,20);
fieldPanel.add(username);
fieldPanel.add(password);
c.add(fieldPanel,"Center");
//底部按钮
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new FlowLayout());
buttonPanel.add(ok);
buttonPanel.add(cancel);
c.add(buttonPanel,"South");
}
public static void main(String[] args){
new Login();
}
}