overriding equals method in java
1. public class Test
2. {
3. private int num;
4. private String data;
5.
6. public boolean equals(Object obj)
7. {
8. if(this == obj)
9. return true;
10. if((obj == null) || (obj.getClass() != this.getClass()))
11. return false;
12. // object must be Test at this point
13. Test test = (Test)obj;
14. return num == test.num &&
15. (data == test.data || (data != null && data.equals(test.data)));
16. }
26. // other methods
27. }override equals java
class Complex {
private double re, im;
public Complex(double re, double im) {
this.re = re;
this.im = im;
}
// Overriding equals() to compare two Complex objects
@Override
public boolean equals(Object o) {
// If the object is compared with itself then return true
if (o == this) {
return true;
}
/* Check if o is an instance of Complex or not
"null instanceof [type]" also returns false */
if (!(o instanceof Complex)) {
return false;
}
// typecast o to Complex so that we can compare data members
Complex c = (Complex) o;
// Compare the data members and return accordingly
return Double.compare(re, c.re) == 0
&& Double.compare(im, c.im) == 0;
}
}
// Driver class to test the Complex class
public class Main {
public static void main(String[] args) {
Complex c1 = new Complex(10, 15);
Complex c2 = new Complex(10, 15);
if (c1.equals(c2)) {
System.out.println("Equal ");
} else {
System.out.println("Not Equal ");
}
}
}Copyright © 2021 Codeinu
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