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// Program 1
public class Test {
  public static void main(String[ ] args) {
  Object a1 = new A();
  Object a2 = new A();
  System.out.println(((A)a1).equals((A)a2));
  }
}
 
class A {
  int x;
 
  public boolean equals(A a) {
  return this.x == a.x;  
  }
}
 
// Program 2
public class Test {
  public static void main(String[ ] args) {
  A a1 = new A();
  A a2 = new A();
  System.out.println(a1.equals(a2));
  }
}
 
class A {
  int x;
 
  public boolean equals(A a) {
  return this.x == a.x;  
  }
}

Main.java:2: error: class Test is public, should be declared in a file named Test.java
public class Test {
       ^
Main.java:19: error: class Test is public, should be declared in a file named Test.java
public class Test {
       ^
Main.java:27: error: duplicate class: A
class A {
^
3 errors

Standard output is empty