JAVA GUI部分程序演示代码.rar_K3T_java gui

//【示例程序c10_10.java】 //设计一个标签、三个滚动条，三个滚动条分别代表红、绿、蓝三种颜色，改变滑块的值从而改变标签背景的颜色。 import java.awt.*; import java.awt.event.*; import javax.swing.*; public class c10_10 implements AdjustmentListener { int r=0,g=0,b=0; String s,s1=" ",s2=" ",s3=" "; JScrollBar sbr,sbg,sbb; //声明建立滚动条对象 JPanel pa1,pa2,pa3; JLabel lb1= new JLabel("刻度："), lb2=new JLabel(" 标签 "), lb3=new JLabel(" 调色版 "), lbr=new JLabel("红色"), lbg=new JLabel("绿色"), lbb=new JLabel("蓝色"); public c10_10( ) { JFrame f = new JFrame("JScrollBar"); Container cp=f.getContentPane( ); Box baseBox=Box.createVerticalBox( ); cp.add(baseBox); Box box1=Box.createHorizontalBox( ); box1.add(lb1); box1.add(lb2); baseBox.add(box1); Box box3=Box.createVerticalBox( ); baseBox.add(box3); lb3.setBackground(new Color(0,0,0)); //设置标签颜色 lb3.setBorder(BorderFactory.createEtchedBorder( ));//设置标签边框 lb3.setOpaque(true); //让组件变为不透明，使标签颜色显示出来 lb3.setMaximumSize(new Dimension(450,200)); box3.add(lb3); sbr=new JScrollBar(JScrollBar.HORIZONTAL,10,10,0,260); //创建水平方向滚动条对象 sbr.setUnitIncrement(5); //设置此滚动条拖动滚动块时的单位增量 sbr.setBlockIncrement(10); //设置鼠标在滚动条上点击时滚动块的块增量 sbr.addAdjustmentListener(this); //注册sbr给监听对象 box3.add(lbr); box3.add(sbr); sbg=new JScrollBar(JScrollBar.HORIZONTAL,10,10,0,260); sbg.setUnitIncrement(5); sbg.setBlockIncrement(10); sbg.addAdjustmentListener(this); box3.add(lbg); box3.add(sbg); sbb=new JScrollBar(JScrollBar.HORIZONTAL,10,10,0,260); sbb.setUnitIncrement(5); sbb.setBlockIncrement(10); sbb.addAdjustmentListener(this); box3.add(lbb);box3.add(sbb); f.pack( ); f.show( ); f.addWindowListener(new WinLis( )); } class WinLis extends WindowAdapter { public void windowClosing(WindowEvent e) { System.exit(0); } } public void adjustmentValueChanged(AdjustmentEvent e) { if ((JScrollBar)e.getSource( )==sbr) { r=e.getValue( ); s1="red: ";} if ((JScrollBar)e.getSource( )==sbg) { g=e.getValue( ); s2="green: ";} if ((JScrollBar)e.getSource( )==sbb) { b=e.getValue( ); s3="blue: ";} s=s1+r+" "+s2+g+" "+s3+b; lb2.setText(s); lb3.setBackground(new Color(r,g,b)); } public static void main(String[ ] arg) { new c10_10( ); } }