StringBuffer equals() in Java

equals(): This method is available in java.lang.StringBuffer class of Java.

Syntax:

boolean java.lang.Object.equals(Object obj)

This method takes one argument as its parameter. This method indicates whether some other object is "equal to" this one.

Note:

1. It is reflexive: for any non-null reference value x, x.equals(x) should return true.

2. It is symmetric: for any non-null reference values x and y, x.equals(y)should return true if and only if y.equals(x) returns true.

3. It is transitive: for any non-null reference values x, y, and z, if x.equals(y)  returns true and y.equals(z) returns true, then x.equals(z) should return true.

4. It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently returns false.

5. For any non-null reference value x, x.equals(null) should return false.

Parameters: obj the reference object with which to compare.

Returns: true if this object is the same as the obj argument; false otherwise.

For Example:

StringBuffer str = new StringBuffer("Hello World")

StringBuffer obj = new StringBuffer("Hello World")

str.equals(obj) = > It returns false.

Approach

Java

public class Equals {
    public static void main(String[] args) {

        StringBuffer str = new StringBuffer("Hello World");

        StringBuffer obj = new StringBuffer("Hello World");
        System.out.println(str.equals(obj));
    }
}

Output:

false