Question

java中怎么设置框架JFrame或者说JPanel？

我不知都用什么方法去设置，求大神赐教，有个小程序的例子就更好了

Answer 1

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;

public class UI extends JFrame implements ActionListener{
private static final long serialVersionUID = 2L;
JTextField jtfDna1=new JTextField(20);
JTextField jtfDna2=new JTextField(20);

JButton jbtSovle;
JButton jbtReset;

JLabel jlbRsDna1;
JLabel jlb_1to2;
JLabel jlbRsDna2;
JLabel jlbEqu;

JLabel jlbExp;
JLabel jlbRs;

DisplayPanel jplCenter;

public UI(){

JPanel jpl1=new JPanel();
jpl1.add(new JLabel("基因序列A:"));
jtfDna1.setText("AGTGATG");
jpl1.add(jtfDna1);

JPanel jpl2=new JPanel();
jpl2.add(new JLabel("基因序列B:"));
jtfDna2.setText("ATTAG");
jpl2.add(jtfDna2);

JPanel jpl3=new JPanel();
jbtSovle=new JButton("计算相似度");
jbtSovle.addActionListener(this);
jbtReset=new JButton("重置");
jbtReset.addActionListener(this);
jbtSovle.setPreferredSize(new Dimension(200,30));
jbtReset.setPreferredSize(new Dimension(100,30));
jpl3.add(jbtSovle);
jpl3.add(jbtReset);

JPanel jplNorth=new JPanel(new GridLayout(3,1));
jplNorth.add(jpl1);
jplNorth.add(jpl2);
jplNorth.add(jpl3);

jplCenter=new DisplayPanel();
jplCenter.setPreferredSize(new Dimension(800, 800));
JScrollPane jslp = new JScrollPane(jplCenter);
jslp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
jslp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

setLayout(new BorderLayout());
add(jplNorth,BorderLayout.NORTH);
add(jslp,BorderLayout.CENTER);

this.setTitle("窗口标题");
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setSize(650, 700);
this.setVisible(true);
}

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