输入一个整数，程序判断该整数是否在数组中

import java.util.*;
public class ArrayTwo {
public static void main(String[] args) {
int start=0,end,middle;
int a[]={12,45,67,89,123,-45,67};
int N=a.length;
for(int i=0;i<N;i++){//选择法排序数组
for(int j=i+1;j<N;j++){
if(a[i]>a[j]){
int t=a[i];
a[i]=a[j];
a[j]=t;
}
}
}
Scanner scanner=new Scanner(System.in);
System.out.println("输入一个整数，程序判断该整数是否在数组中");
int number=scanner.nextInt();
int count=0;
end=N;
middle=(start+end)/2;
while(number!=middle){
if(number>a[middle])
start=middle;
else if(number<middle)
end=middle;
middle=(start+end)/2;
count++;
if(count>N/2)
break;
}
if(count>N/2)
System.out.printf("%d不在数组中.\n",number);
else
System.out.printf("%d在数组中.\n",number);
}

}