Java 14a - call by value

class Lab14a 
{ 
int x,y,temp;
void m1(int x,int y) 
{ 
temp=x; 
x=y; 
y=temp; 
System.out.println("a er swapping"); 
System.out.println("x="+x); 
System.out.println("y="+y); 
} 
public sta c void main(String... args) 
{ 
Lab14a a=new Lab14a(); 
a.x=46; 
a.y=17; 
a.m1(46,17); 
System.out.println("before swapping"); 
System.out.println("x="+a.x+"y="+a.y); 
}}