java下拉菜单联动 java下拉菜单代码

//核心代码String[] sg= {"苹果","香蕉","樱桃","山楂"};JComboBox<String> jcb = new JComboBox<String>(sg);完整代码import java.awt.*;import javax.swing.*;public class MFrame extends JFrame{public MFrame() {String[] sg= {"苹果","香蕉","樱桃","山楂"};JComboBox<String> jcb = new JComboBox<String>(sg);add(jcb);setLayout(new FlowLayout());//把JFrame设置成流式布局setTitle("测试");//设置窗口标题setSize(220, 100);//设置窗口大小setLocationRelativeTo(null);//设置窗口居中setDefaultCloseOperation(EXIT_ON_CLOSE);//设置点击关闭退出jvm虚拟机setVisible(true);//设置窗口可见}public static void main(String[] args) {new MFrame();//创建窗口}}