swing下拉框从mysql_swing 下拉菜单

最新推荐文章于 2021-02-13 00:08:21 发布

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#swing下拉框从mysql

该博客介绍了如何使用Java Swing创建一个包含下拉菜单和单选按钮的简单用户界面。用户可以选择不同的水果选项，并通过单选按钮进行交互。程序实现了对用户选择的监听和响应，当选择特定水果时会打印相应的信息。

package rom;

import java.lang.*;

import javax.swing.BorderFactory;

import javax.swing.ButtonGroup;

import javax.swing.JButton;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JRadioButton;

import javax.swing.WindowConstants;

import javax.swing.border.BevelBorder;

import javax.swing.plaf.BorderUIResource;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.ItemEvent;

import java.awt.event.ItemListener;

public class Xamle_4 extends JFrame{

public Xamle_4(String name) {

JFrame jf =new JFrame(name);

Container container = jf.getContentPane();

jf.setLayout(null);

//container.setLayout(new GridLayout(2, 1,10,10)); //设置布局方式

JPanel p1 = new JPanel();

JPanel p2 = new JPanel();

JPanel p3 = new JPanel();

JPanel p4 = new JPanel();

JPanel p5 = new JPanel();

JPanel p6 = new JPanel();

String [] strings = {"菠萝","香蕉","苹果","哈密瓜","西瓜"}; //创建下拉菜单栏的信息

JComboBox jComboBox = new JComboBox<>(strings); //创建下拉菜单栏

jComboBox.addItemListener(new ItemListener() { //点击下拉多选菜单的监控

@Override

public void itemStateChanged(ItemEvent e) {

if (e.getStateChange()==ItemEvent.SELECTED) { //选择点击

System.out.println("你选择的是：");

}

if(jComboBox.getSelectedItem().equals("菠萝")) {

System.out.println("菠萝");

}

if(jComboBox.getSelectedItem().equals("香蕉")) {

System.out.println("香蕉");

}

if(jComboBox.getSelectedItem().equals("苹果")) {

System.out.println("苹果");

}

if(jComboBox.getSelectedItem().equals("哈密瓜")) {

System.out.println("哈密瓜");

}

if(jComboBox.getSelectedItem().equals("西瓜")) {

System.out.println("西瓜");

}

// TODO Auto-generated method stub

}

});

JRadioButton jr1 = new JRadioButton("按键1"); //添加单选按键

JRadioButton jr2 = new JRadioButton("按键2"); //添加单选按键

// p1.setPreferredSize(new Dimension(150, 150)); //设置Jpanel 首选大小，Dimension是尺子工具的意思面板大小

// p2.setPreferredSize(new Dimension(150, 150)); //设置JPanel 面板大小

ButtonGroup group = new ButtonGroup(); //创建单选按键集合

p1.setBorder(BorderFactory.createTitledBorder("选择框边框")); //设置P1面板的边界显示方式，此方式为标题边框 //BorderFactory 是边界工具的意思

p2.setBorder(BorderFactory.createEmptyBorder()); //创建空白边框

p3.setBorder(BorderFactory.createLineBorder(Color.BLUE)); //创建线边框 (选择蓝色)

p4.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED)); //创建凸起效果边框

p5.setBorder(BorderFactory.createMatteBorder(20, 20, 20, 20, Color.yellow)); //创建带厚度和颜色的边框

p6.setBorder(BorderFactory.createSoftBevelBorder(BevelBorder.LOWERED)); //创建带凹面效果的边框

p1.setBounds(1, 1, 200, 200); //设置p1 面板的位置和大小

p2.setBounds(201, 1, 200, 200); //设置p2 面板的位置和大小

p3.setBounds(402, 1, 200, 200);

p4.setBounds(1, 201, 200, 200);

p5.setBounds(201, 201, 200, 200);

p6.setBounds(402, 201, 200, 200);

group.add(jr1); //将单选按钮添加到一个组合中

group.add(jr2);

p1.add(jr1);

p1.add(jr2);

p2.add(new JButton("1"));//创建一个按钮

p3.add(new JButton("2"));

p4.add(new JButton("3"));

p5.add(jComboBox); //将下拉菜单添加到面板里

container.add(p1);

container.add(p2);

container.add(p3);

container.add(p4);

container.add(p5);

container.add(p6);

jf.setVisible(true); //将框体可视

jf.setSize(630, 500); //宽和高

setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE); //设置关闭方式

}

public static void main(String [] agrs) {

new Xamle_4("单选按键测试");

}