why the output it's not 30 30 the actual output is: "30 1020"

Question

public class YourClassNameHere {
public static void main(String[] args) {
int a =10;
int b=20;
System.out.println(a+b +" "+ a+b);

}
}

Answer 1

If you want to change the order of how the expression is being evaluated, you have to use parentheses.

Try this:
System.out.println(a+b+" "+(a+b));

Answer 2

Implicit string concatenation and implicit conversion is what's going on there, since the expression is evaluated from left to right