Java.lang Class - Finding the output Questions and Answers

What will be the output of the program?

public class Listing61
{
    Listing61()
    {
        StringBuffer buf = new StringBuffer("log");
        buf.append(":").append(1);
        String s = buf.toString();
        System.out.println(s + " " + s.length());
    }

    public static void main(String[] args)
    {
        new Listing61();
    }
}

What will be the output of the program?

public class Fragment62
{
    public static void main(String[] args) throws Exception
    {
        StringBuilder sb = new StringBuilder();
        for (int i = 3; i > 0; i--) sb.append(i);
        System.out.println(sb + " " + sb.length());
    }
}

What will be the output of the program?

public class Example63
{
    private static void report()
    {
        String s = "a-b-c";
        String[] two = s.split("-", 2);
        System.out.println(two.length + " " + two[1]);
    }

    public static void main(String[] args)
    {
        report();
    }
}

What will be the output of the program?

public class Program64
{
    void execute()
    {
        boolean underscoreOk = Character.isLetterOrDigit('_');
        boolean tabIsSpace = Character.isWhitespace('\t');
        System.out.println(underscoreOk + " " + tabIsSpace);
    }

    public static void main(String[] args)
    {
        Program64 demo = new Program64();
        demo.execute();
    }
}

What will be the output of the program?

public class Trial65
{
    public static void main(String[] args)
    {
        String s = "one";
        switch (s)
        {
            case "one": System.out.print("1");
            case "two": System.out.print("2"); break;
            default: System.out.print("?");
        }
    }
}

What will be the output of the program?

public class Case66
{
    static void show()
    {
        Integer count = 5;
        int doubled = count * 2;
        Integer boxedAgain = doubled;
        System.out.println(doubled + " " + boxedAgain.equals(10));
    }

    public static void main(String[] args)
    {
        show();
    }
}

What will be the output of the program?

public class Sketch67
{
    void run()
    {
        System.out.println(Boolean.compare(true, false) + " " + Boolean.logicalXor(true, true));
    }

    public static void main(String[] args)
    {
        new Sketch67().run();
    }
}

What will be the output of the program?

public class Item68
{
    public static void main(String... args)
    {
        Object a = new Object();
        Object b = a;
        System.out.println((a.equals(b)) + " " + (System.identityHashCode(a) == System.identityHashCode(b)));
    }
}

What will be the output of the program?

public class Sample69
{
    Sample69()
    {
        double d = 1e3;
        float f = 1.5f;
        System.out.println(d + " " + (d + f));
    }

    public static void main(String[] args)
    {
        new Sample69();
    }
}

What will be the output of the program?

public class Probe70
{
    public static void main(String[] args) throws Exception
    {
        String s = "\u0041BC";
        System.out.println(s + " " + s.length());
    }
}