Equality for Reference Variables : Comparison Operators « Operators « SCJP

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SCJP » Operators » Comparison Operators

2.6.15.Equality for Reference Variables

import javax.swing.JButton;

class MainClass {

  public static void main(String[] args) {

    JButton a = new JButton("Exit");

    JButton b = new JButton("Exit");

    JButton c = a;

    System.out.println("Is reference a == b? " + (a == b));

    System.out.println("Is reference a == c? " + (a == c));

  }

}

2.6.Comparison Operators
	2.6.1.	Comparison Operator Summary
	2.6.2.	Comparison operators <, <=, >, >=, = =, and != return a boolean result.
	2.6.3.	Comparison operators are commonly used to form conditions
	2.6.4.	The Ordinal Comparisons Operators: <, <=, >, and >=
	2.6.5.	It is acceptable to compare the float value to the char variable c.
	2.6.6.	Ordinal comparisons are not applicable to any non-numeric types.
	2.6.7.	The Equality Comparison Operators: == and != for primitive types
	2.6.8.	The Equality Comparison Operators: == and != for variables of object type
	2.6.9.	You should not use these operators to compare the contents of objects.
	2.6.10.	To do a content comparison, use equals() method rather than the == or != operator.
	2.6.11.	For object references, the == operator returns true only if both references are to the same object.
	2.6.12.	Define your own equals Method
	2.6.13.	The == with Strings Trap
	2.6.14.	"Equality" Operators
	2.6.15.	Equality for Reference Variables
	2.6.16.	Equality for Enums

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