how to set boolean to false if null in java

/**
 * @author lautturi.com
 * Java example: set boolean value to false if its null
 */

import java.util.*;
import java.text.DecimalFormat;

public class Lautturi {

	public static void main(String[] args) {

		String var1 = "Lautturi";
		String var2 = "";
		Boolean var3 = true;
		Boolean var4 = false;
		String var5 = null;
		Boolean var6 = (var1!=var2);
		
		System.out.println("var1: "+Boolean.TRUE.equals(var1));
		System.out.println("var2: "+Boolean.TRUE.equals(var2));
		System.out.println("var3: "+Boolean.TRUE.equals(var3));
		System.out.println("var4: "+Boolean.TRUE.equals(var4));
		System.out.println("var5: "+Boolean.TRUE.equals(var5));
		System.out.println("var6: "+Boolean.TRUE.equals(var6));

		
	}
}

output:

var1: false
var2: false
var3: true
var4: false
var5: false
var6: true