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Sorting Four Number in JAVA.(without inbuilt function)

The four number declare before a program
CODING:
class sort1{
 public static void main(String ar[]){
  int a=2,b=4,c=3,d=1,temp;
  if(a>b){temp=a;a=b;b=temp;}
  if(c>d){temp=c;c=d;d=temp;}
  if(a>c){temp=a;a=c;c=temp;}
  if(b>d){temp=b;b=d;d=temp;}
  if(b>c){temp=b;b=c;c=temp;}
  System.out.print(a+" "+b+" "+c+" "+d);
 }
}

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