Counting Sort

public class CountingSort{
public int[] sort(int[] a){
int[] c=new int[a.length];
for(int i=0;i<a.length;i++)
c[i]=0;
for(int i=0;i<a.length;i++){
for(int j=i+1;j<a.length;j++){
if(a[i]<a[j])
c[j]++;
else
c[i]++;
}
}
int[] b=new int[a.length];
for(int i=0;i<a.length;i++){
b[c[i]]=a[i];
}
return b;
}

public static void main(String[] args){
int[] key={1,4,6,2,3,7};
CountingSort count=new CountingSort();
int[] temp=count.sort(key);
String str=new String();
for(int i=0;i<key.length;i++){
str+=String.valueOf(temp[i]);
}
System.out.println(str);
}
}