Float equals() method in Java with examples

26 Oct, 2018
The equals() method in Float Class is a built-in function in java that compares this object to the specified object. The result is true if and only if the argument is not null and is a Float object that contains the same double value as this object. It returns false if both the objects are not same.
Syntax:
public boolean equals(Object obj)
Parameter: The method accepts only one parameter obj which specifies the passed object is the object that is to be compared with.
Return Values: The function returns a boolean value after comparing with the object passed in the parameter:
It returns true if and only if the argument is not null and is a Float object that contains the same double value as this object. It returns false if the object is not same.
If f1 and f2 both is represented as Float.NaN, then the equals() method returns true, even if Float.NaN==Float.NaN has the value false.
If f1 represents +0.0f while f2 represents -0.0f, or vice versa, the equal test has the value false, even though 0.0f==-0.0f has the value true.
Below programs illustrates the use of Float.equals() method:
Program 1:
// Java program to demonstrate// Float.equals() method  import java.lang.*;  class Gfg1 {      public static void main(String args[])    {          // When two objects are different        Float obj1 = new Float(123123);        Float obj2 = new Float(164165);          System.out.print("The objects " + obj1                         + " and " + obj2                         + "are : ");        if (obj1.equals(obj2))            System.out.println("Equal");        else            System.out.println("Not equal");          // When two objects are equal        obj1 = new Float(12345);        obj2 = new Float(12345);        System.out.print("The objects " + obj1                         + " and " + obj2                         + "are : ");        if (obj1.equals(obj2))            System.out.print("Equal");        else            System.out.print("Not Equal");    }}
The objects 123123.0 and 164165.0are : Not equal
The objects 12345.0 and 12345.0are : Equal

Program 2: Using Float.NaN
// Java program to demonstrate// Float.equals() method  import java.lang.*;  class Gfg1 {      public static void main(String args[])    {          Float obj1 = new Float(Float.NaN);        Float obj2 = new Float(Float.NaN);          System.out.print("The objects " + obj1                         + " and " + obj2                         + "are : ");        if (obj1.equals(obj2))            System.out.println("Equal");        else            System.out.println("Not equal");    }}
The objects NaN and NaNare : Equal

Program 3: Using float value 0.0f
// Java program to demonstrate// Float.equals() method  import java.lang.*;  class Gfg1 {      public static void main(String args[])    {          Float obj1 = new Float(0.0f);        Float obj2 = new Float(-0.0f);          System.out.print("The objects " + obj1                         + " and " + obj2                         + "are : ");        if (obj1.equals(obj2))            System.out.println("Equal");        else            System.out.println("Not equal");    }}
The objects 0.0 and -0.0are : Not equal

Reference: https://docs.oracle.com/javase/7/docs/api/java/lang/Float.html#equals(java.lang.Object)
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