Boolean

[Saurabh Malhotra]

2) why the output is truetruefalse?
Boolean b1 = new Boolean("TRUE");
Boolean b2 = new Boolean("true");
Boolean b3 = new Boolean("JUNK");
System.out.println("" + b1 + b2 + b3);
a) Comiler error
b) RunTime error
c)truetruefalse
d)truetruetrue

[Venkata Koneti]

If you give a String value that is True to the boolean wrapper Class - Boolean , irrespective of the case, the value is stored as true. Anything other than that is stored as false.
Hope this clears.

[Valentin Crettaz]

Sometimes it helps having a look at the JDK sources. And what's more, it is a very useful source of information.
Here is the relevant code of the java.lang.Boolean class that shows you why the output is truetruefalse:

public Boolean(boolean value) {
   this.value = value;
}
public Boolean(String s) {
   this(toBoolean(s));
}
private static boolean toBoolean(String name) {
   return ((name != null) && name.equalsIgnoreCase("true"));
}

[Jonathas Carrijo]

Hi...
I think that's because of the overloaded form of the '+' operator. When one of its operands is a String, the other operand will be somehow transformed to a String. Literal values will become a String representation of them... and objects in general will have their toString() method called.
The toString() method of an object of tipe Boolean returns a String representing the encapsulated value.
If I said anything stupid please help me telling...
Thanx