3月10日，select，每日20行。

import java.awt.*; public class select { public static void main(String[] args) { Frame f = new Frame("A Test Window"); f.setSize(400,100); f.setLayout(new FlowLayout(FlowLayout.CENTER)); f.add(new Label("What are you like:")); f.add(new Checkbox("Apple")); f.add(new Checkbox("Orange")); f.add(new Checkbox("Strawberry")); f.add(new Checkbox("Peach")); f.add(new Label("Sex:")); CheckboxGroup cbg = new CheckboxGroup(); f.add(new Checkbox("Male",cbg,true)); f.add(new Checkbox("Female",cbg,false)); f.setVisible(true); } }