What is the prototype of the default constructor?

public class Test { }

1. Assertion checking is typically enabled when a program is deployed.
2. It is never appropriate to write code to handle failure of an assert statement.
3. Assertion checking is typically enabled during program development and testing.
4. Assertion checking can be selectively enabled or disabled on a per-package basis, but not on a per-class basis.
5. Assertion checking can be selectively enabled or disabled on both a per-package basis and a per-class basis.

class s implements Runnable 
{ 
    int x, y; 
    public void run() 
    { 
        for(int i = 0; i < 1000; i++) 
            synchronized(this) 
            { 
                x = 12; 
                y = 12; 
            } 
        System.out.print(x + " " + y + " "); 
    } 
    public static void main(String args[]) 
    { 
        s run = new s(); 
        Thread t1 = new Thread(run); 
        Thread t2 = new Thread(run); 
        t1.start(); 
        t2.start(); 
    } 
}

public class ThreadTest extends Thread 
{ 
    public void run() 
    { 
        System.out.println("In run"); 
        yield(); 
        System.out.println("Leaving run"); 
    } 
    public static void main(String []argv) 
    { 
        (new ThreadTest()).start(); 
    } 
}

1. int w = (int)888.8;
2. byte x = (byte)1000L;
3. long y = (byte)100;
4. byte z = (byte)100L;

int I = 0;
label:
    if (I < 2) {
    System.out.print("I is " + I);
    I++;
    continue label;
}

interface Foo141 
{ 
    int k = 0; /* Line 3 */
} 
public class Test141 implements Foo141 
{
    public static void main(String args[]) 
    {
        int i; 
        Test141 test141 = new Test141(); 
        i = test141.k; /* Line 11 */
        i = Test141.k; 
        i = Foo141.k; 
    } 
}

public class Test 
{  
    public static void main(String args[]) 
    { 
        int i = 1, j = 0; 
        switch(i) 
        { 
            case 2: j += 6; 
            case 4: j += 1; 
            default: j += 2; 
            case 0: j += 4; 
        } 
        System.out.println("j = " + j); 
    } 
}

Float f = new Float("12"); 
switch (f) 
{
    case 12: System.out.println("Twelve"); 
    case 0: System.out.println("Zero"); 
    default: System.out.println("Default"); 
}

for (int i = 0; i < 4; i += 2) 
{ 
    System.out.print(i + " "); 
} 
System.out.println(i); /* Line 5 */