【Java基础之】Map存储颜色

利用Map存储颜色与串的对应关系，编写一个窗体应用，在窗体中安排若干获取颜色的按钮，按钮名称与Map中颜色串名称一致， 点击按钮，则窗体的背景色设为指定的颜色。 Map<String,Color>中含红色、绿色、蓝色、黄色、白色、橙色等。 import java.util.*; import java.awt.Color; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class mapTest { public static void main(String[] args) { // TODO Auto-generated method stub Map〈String,Color> map = new HashMap〈String, Color>(); map.put("black", Color.BLACK); map.put("red", Color.RED); map.put("green", Color.GREEN); map.put("yellow", Color.YELLOW); map.put("white", Color.WHITE); map.put("gray", Color.GRAY); JPanel jp =new JPanel(); JButton jt = new JButton(); jt.setText("颜色1"); jt.setBackground(map.get("black")); jp.add(jt); jt.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub jp.setBackground(map.get("black")); } }); JButton jt2 = new JButton(); jt2.setText("颜色2"); jt2.setBackground(map.get("red")); jp.add(jt2); jt2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub jp.setBackground(map.get("red")); } }); JButton jt3 = new JButton(); jt3.setText("颜色3"); jt3.setBackground(map.get("green")); jp.add(jt3); jt3.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub jp.setBackground(map.get("green")); } }); JButton jt4 = new JButton(); jt4.setText("颜色4"); jt4.setBackground(map.get("yellow")); jp.add(jt4); jt4.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub jp.setBackground(map.get("yellow")); } }); JFrame frame = new JFrame("Panel!"); frame.getContentPane().add(jp); frame.pack(); frame.setVisible(true); } }