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class tem{
	int a=10;
	int b=30;
public static void main(String args[]){
int temp=a;
a=b;
b=temp;
System.out.println("the swapped no"+a);
System.out.println("the swapped no"+b);
}
}
 
 
 

Main.java:5: error: non-static variable a cannot be referenced from a static context
int temp=a;
         ^
Main.java:6: error: non-static variable a cannot be referenced from a static context
a=b;
^
Main.java:6: error: non-static variable b cannot be referenced from a static context
a=b;
  ^
Main.java:7: error: non-static variable b cannot be referenced from a static context
b=temp;
^
Main.java:8: error: non-static variable a cannot be referenced from a static context
System.out.println("the swapped no"+a);
                                    ^
Main.java:9: error: non-static variable b cannot be referenced from a static context
System.out.println("the swapped no"+b);
                                    ^
6 errors

Standard output is empty