[!INDEX]

1. comparison == vs equals
2. Points to Remember
3. syntax for object, boolean mt ( equals for reference )
4. syntax for class, boolean mt ( equals for object )

1. comparison == vs equals

public class M05 { 
    public static void main(String[] args) { 
    String s1 = new String("rajat");// in heap and SCP 
    String s2 = new String("rajat");// in heap area only 
    System.out.println(s1==s2);// false 
    System.out.println(s1.equals(s2));// true  
    // s1 refer to first rajat in heap 
    // s2 refer to second rajat 
    // == checkes the address, reference comparision 
    String s3="manoj"; // in SCP area 
    String s4="manoj"; // try to make but already present then 
    System.out.println(s3==s4);// true, coz both same location 
    System.out.println(s3.equals(s4));// true   
    // equalsto is the object class m/T, string overrides it 
    } 
}

2. Points to Remember

[!NOTE]

1. ==
2. reference/address comparison.
3. means both objects point to the same memory location or not. 2.
4. equals
5. content comparison (in String class).
6. means check object value.
7. equals (of object class )
8. compare the reference/address of two objects
9. i.e if two objects point to the same memory location or not. 4.
10. equals (of string class )
11. equals method is override by string
12. equal is the object class method ( total 11 method )

3. syntax for object, boolean mt ( equals for reference )

 class Object { 
         public boolean equals (Objects obj) { 
             return (this==obj); 
         } 
     } 
//  the above is used for reference comparision 

4. syntax for class, boolean mt ( equals for object )

    class String extends Object { 
        public boolean equals (Objects obj)
        { // statements 

        } 
    }