谁帮忙修改一下！！

cooma 2008-04-23 03:58:50

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
class Alg extends Applet{
static int set=1,delayTime=50;
static boolean stop=true;
Graphics mypen;
Button test=new Button("start");
int[] data={18,4,17,5,13,8,14,7,10,16,11,3,19,2,20,15,6,9,1,12};
public Alg(){
add(test);
setSize(400,530);
test.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(e.getSource()==test) set++;
Choosealg();
}
});
}
public void paint(Graphics g){

}
public void Choosealg(){
switch(set){
case 1:
mypen.setColor(Color.black);
mypen.drawString("算法：Bubble\n输入：数组data[]\n输出：按非降序排列的数组data[]\n",50,50);
mypen.drawString("1.for i<—data.length-1 to 0",50,80);
mypen.drawString("2. for j<— 0 to i",50,90);
mypen.drawString("3. if a[j] > a[j+1] then",50,100);
mypen.drawString("4. 交换a[j] 与 a[j+1]",50,110);
mypen.drawString("5. end if",50,120);
mypen.drawString("6. end for",50,130);
mypen.drawString("7.end for",50,140);
break;
case 2: mypen.setColor(Color.black);
mypen.drawString("算法：Selection\n输入：数组data[]\n输出：按非降序排列的数组data[]\n",50,50);
mypen.drawString("1.for i<—data.length-1 to 0",50,80);
mypen.drawString("2. T<—0",50,90);
mypen.drawString("3. for j<— 1 to i",50,100);
mypen.drawString("4. if a[j] > a[T] then",50,110);
mypen.drawString("5. T<—j",50,120);
mypen.drawString("5. end if",50,130);
mypen.drawString("6. end for",50,140);
mypen.drawString("7. 交换 a[i] 与 a[T]",50,150);
mypen.drawString("8.end for",50,160);break;
}
switch(set){
case 1:Bubble(data);break;
case 2:Selection(data);break;
}
}

public void pause(){ //延时
if(stop){return;}
try {
Thread.sleep(delayTime);
} catch (InterruptedException e) {
e.printStackTrace();
}
if(stop){return;}
}
//冒泡排序
public void Bubble(int a[]){
for (int i = a.length; --i>=0;){
if(mypen.getColor()==Color.red) mypen.setColor(Color.blue);
else mypen.setColor(Color.red);

mypen.drawString("1.for i<—data.length-1 to 0",50,80);
for (int j = 0; j <i; j++){
if(mypen.getColor()==Color.red) mypen.setColor(Color.blue);
else mypen.setColor(Color.red);

mypen.drawString("2. for j<— 0 to i",50,90);
mypen.drawString("3. if a[j] > a[j+1]",50,100);
if(stop){return;}
pause();
if (a[j] > a[j+1]) {
int T = a[j];
a[j] = a[j+1];
a[j+1] = T;
mypen.drawString("4. 交换a[j] 与 a[j+1]",50,110);
pause();
}
mypen.drawString("6. end for",50,130);
}
mypen.drawString("6. end for",50,120);
}
mypen.drawString("7.end for",50,130);
}

//选择排序
public void Selection(int a[]){

for (int i = a.length-1; i > 0; i--) {

if(mypen.getColor()==Color.red) mypen.setColor(Color.blue);
else mypen.setColor(Color.red);

mypen.drawString("1.for i<—data.length-1 to o",50,80);
mypen.drawString("2. T<—0",50,90);
int T = 0;

for (int j = 1; j <= i; j++) {

if(stop){return;}
mypen.drawString("3. for j<— 1 to i",50,100);
mypen.drawString("4. if a[j] > a[T] then",50,110);
pause();
if(a[j] > a[T]) {

T = j;

mypen.drawString("5. T<—j",50,120);
}

mypen.drawString("5. end if",50,130);
mypen.drawString("6. end for",50,140);
}

int temp = a[i];

a[i] = a[T];

a[T] = temp;

mypen.drawString("7. 交换 a[i] 与 a[T]",50,150);
pause();
}

mypen.drawString("8.end for",50,160);
}
}
大虾们，帮忙改一下，或重新帮忙写一个，功能就是显示算法的执行步骤。

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