急求java冒泡排序 快速排序 二分之一查找的代码

Question

冒泡循环中定义的i,j都是什么了的 以前学过 不过忘得差不多了 哎

Answer 1

//标记法
public class Test {
public static void main(String[] args){
int[] array = {9,7,5,8,7,5,3,8,4,2,6,1,0};
for(int i = 0; i<array.length; i++){
int temp = i;
for(int j=i+1; j<array.length; j++){
if(array[temp]>array[j]){
temp=j;
}
}
int buff = array[temp];
array[temp] = array[i];
array[i] = buff;
}

for(int a : array){
System.out.println(a);
}
}
}

//二分之一
public class Test {
public void find(int x){
int[] s = {1,2,3,6,7,8,9,12,13,14,15,16,17,18,19,20,23,25,27,30,32,40,50};
int start = 0;
int end = s.length;
int half = end/2;
while(true){
if(s[half]<x){
start = half;
half = half + (end-start)/2;
}else if(s[half]>x){
end = half;
half = half - (end-start)/2;
}else{
System.out.println(half+1);
break;
}

}
}
public static void main(String[] args){
new Test().find(20);
}
}

Answer 2

冒泡排序

public class Maopao {

/**
* @param args
*/
public static void main(String[] args) {
int a[]={1,9,8,55,44,66,99,33,22,77};
int b;
for(int i=0;i<a.length-1;i++)
for(int j=i+1;j<a.length;j++)
{
if(a[i]<a[j])
{
b=a[i];
a[i]=a[j];
a[j]=b;
}
}
for(int i=0;i<a.length;i++)
System.out.println("--"+a[i]);

}

}