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当我运行此程序时,当我使用setSize来确定窗口大小时,窗口将挡住面板2中的按钮。另外,如果我使用frame.pack()而不是setSize(),所有组件都在一条水平线上,但我试图让它们使panel1组件位于同一行,而panel2组件位于在他们的下面。并非所有显示的组件
有人可以详细解释这两个问题的答案吗?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Exercise16_4 extends JFrame{
// FlowLayout components of top portion of calculator
private JLabel jlbNum1 = new JLabel("Number 1");
private JTextField jtfNum1 = new JTextField(4);
private JLabel jlNum2 = new JLabel("Number 2");
private JTextField jtfNum2 = new JTextField(4);
private JLabel jlbResult = new JLabel("Result");
private JTextField jtfResult = new JTextField(8);
// FlowLayout Components of bottom portion of calculator
private JButton jbtAdd = new JButton("Add");
private JButton jbtSubtract = new JButton("Subtract");
private JButton jbtMultiply = new JButton("Multiply");
private JButton jbtDivide = new JButton("Divide");
public Exercise16_4(){
JPanel panel1 = new JPanel();
panel1.setLayout(new FlowLayout(FlowLayout.CENTER, 3, 3));
panel1.add(jlbNum1);
panel1.add(jtfNum1);
panel1.add(jlNum2);
panel1.add(jtfNum2);
panel1.add(jlbResult);
panel1.add(jtfResult);
JPanel panel2 = new JPanel();
panel2.setLayout(new FlowLayout(FlowLayout.CENTER, 3, 10));
panel1.add(jbtAdd);
panel1.add(jbtSubtract);
panel1.add(jbtMultiply);
panel1.add(jbtDivide);
add(panel1, BorderLayout.NORTH);
add(panel2, BorderLayout.CENTER);
}
public static void main(String[] args){
Exercise16_4 frame = new Exercise16_4();
frame.setTitle("Caculator");
frame.setSize(400, 200);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//frame.setResizable(false);
frame.setVisible(true);
}
}
我明白,目前的任务有更好的布局管理器,但问题明确要求FlowLayout用于panel1和panel2 – 2012-04-08 03:02:39