app18_7.java

这是大学里的 java课后题的答案

import java.awt.*;
import java.awt.event.*;
public class app18_7 extends Frame implements AdjustmentListener
{
	static app18_7 frm=new app18_7();
	static Label lab=new Label();
	static Scrollbar scr1=new Scrollbar(Scrollbar.VERTICAL);
	static Scrollbar scr2=new Scrollbar(Scrollbar.HORIZONTAL);
	static Scrollbar scr3=new Scrollbar(Scrollbar.VERTICAL);
	public static void main(String args[])
	{
		frm.setSize(200,150);
		BorderLayout bord=new BorderLayout();
		frm.setLayout(bord);
	    frm.add(scr1,bord.WEST);
	    frm.add(scr2,bord.SOUTH);
	    frm.add(scr3,bord.EAST);
	    frm.add(lab,bord.CENTER);
	    scr1.setValues(0,45,0,300);
	    scr2.setValues(0,45,0,300);
	    scr3.setValues(0,45,0,300);
	    lab.setText("Color(0,0,0)");
	    lab.setBackground(new Color(0,0,0));
	    lab.setAlignment(Label.CENTER);
	    scr1.addAdjustmentListener(frm);
	    scr2.addAdjustmentListener(frm);
	    scr3.addAdjustmentListener(frm);
	    frm.setVisible(true);
	}
	public void adjustmentValueChanged(AdjustmentEvent e)
	{
		int red=scr1.getValue();
		int green=scr2.getValue();
		int blue=scr3.getValue();
		lab.setBackground(new Color(red,green,blue));
		lab.setText("Color("+red+","+green+","+blue+")");
	}
	
}