What is the concept Below???

class A  {
    int x=10;
};

class B extends A  {
    int x=100;
    show()     {
        System.out.println(x);
    }
    public static void main(String... s)  {
        B b1=new B();
        b1.show();
    }
};

The program will print 100. But the concept illustrated is----

What is the output??(Easy One)

String s1="Java";
String s2="Java";
String s3=new String("Java");
String s4=new String("Java");
if(s1==s2)  System.out.print("true");
else  System.out.println("false");
if(s3==s4)  System.out.print("true");
else  System.out.println("false");
if(s1==s3)  System.out.print("true");
else  System.out.println("false");
if(s2==s3.intern())  System.out.print("true");
else  System.out.println("false");
if(s3.intern()==s2.intern())  System.out.print("true");
else  System.out.println("false");

Just try and get the Ouput---(Ignore any errors)

The regex /g.d?c*/ doesn't match

What is the outcome of the scenario on Unix platform: open(FH, ">c:\temp\notes.txt") ?

$a=[ { name=> "rose", kids=> [ qw( ted bobby john ) ] }, { name=> "marge", kids=> [ qw( maggie lisa bart ) } ]

($t, @u, $v, @w ) = qw( India US Japan Spain Mexico China ). How many elements are assigned to @u,@w?

Out of below four cases

1. -5+5
   
2. " "
   
3. 0X0
   
4. "0.00" + 0

Can we use the constructor, instead of init(), to initialize servlet?

Which of the following should NOT be used to share data between servlets in a distributed web application?

Can we call destroy() method on servlets from service method ?

Can we implement an interface in JSP ?