JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to create Boolean wrapper object?


Description:

You can create Boolean wrapper class object by passing either boolean primitive value or boolean value as a string to the Boolean constructor.


Code:
package com.java2novice.wrapper.booleanexp;

public class MyBasicBoolean {

	public static void main(String a[]){
		//create Boolean using boolean primitive type
		boolean b1 = true;
		Boolean bObj1 = new Boolean(b1);
		System.out.println("Wrapper class Boolean output: "+bObj1);
		//create Boolean using string value
		Boolean bObj2 = new Boolean("false");
		System.out.println("Wrapper class Boolean output: "+bObj2);
		//how to get primitive boolean value from wrapper class
		System.out.println(bObj1.booleanValue());
	}
}

Output:
Wrapper class Boolean output: true
Wrapper class Boolean output: false
true
 Next Program >>

List of Boolean wrapper class programs:

  1. How to create Boolean wrapper object?
  2. How to convert string to boolean value?
  3. Primitive boolean constants.
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What is fail-fast in java?
A fail-fast system is nothing but immediately report any failure that is likely to lead to failure. When a problem occurs, a fail-fast system fails immediately. In Java, we can find this behavior with iterators. Incase, you have called iterator on a collection object, and another thread tries to modify the collection object, then concurrent modification exception will be thrown. This is called fail-fast.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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