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public class Test {
  int a = 1;
  int b = 2;
 
  int calcSum(int a, int b) {
    return (a + b);
  }
 
  public static void main(String[] args) {
    Test t = new Test();
    int c = t.calcSum(a, b);
    System.out.println(c);
  }
}

Main.java:1: class Test is public, should be declared in a file named Test.java
public class Test {
       ^
Main.java:11: non-static variable a cannot be referenced from a static context
    int c = t.calcSum(a, b);
                      ^
Main.java:11: non-static variable b cannot be referenced from a static context
    int c = t.calcSum(a, b);
                         ^
3 errors

Standard output is empty