SCJP 1.4 Mock Exam – 14

import 
public 
private
Vector
Serializable
File
Color
extends
boolean
implements

What is the correct declaration?

  
extends
public
int
class
someclassname
somesuperclass
implements
File
extends
Class
final

What is the right syntax declaration of this class (without {)?

public class test {
   public static void main(String args[]) { 
      String str1=”abc”;
      String str2=”def”;
      String str3=str1.concat(str2);

      str1.concat(str2);
      System.out.println(str1);
   }
}

class test {
    public static void main(String args[]) {
        char ch;
        String test2 = “abcd”;
        String test = new String(“abcd”);
        if(test.equals(test2)) {
            if(test == test2)
                ch = test.charAt(0);
            else
                ch = test.charAt(1);	           
        }
        else {
            if(test == test2)
                ch = test.charAt(2);
            else                
                ch = test.charAt(3);
        }
        System.out.println(ch);
    }
}

class Background implements Runnable {
  int i=0; 

  public int run() {
         while(true) {
                i++;
                System.out.println(“i=”+i);
            }
     }
}

public class TechnoSample {
    public static void main(String argv[]) {
        TechnoSample sample = new TechnoSample();
        sample.amethod();
    }

    public void amethod() {
        int oi= 012;
        System.out.println(oi);
    }
} // Oct

//Base.java
package Base;

class Base {
    protected void amethod() {
        System.out.println(“amethod”);
    }
} // Base

package Class1;

public class Class1 extends Base {
    public static void main(String argv[]) {
        Base b = new Base();
        b.amethod();
    }
} // Class1

class TechnoSample {
  public static void main(String args[]) {
    short[] s = {1, -1, 3, 4};
    for (int i = 0; i
      switch(s[i]) {
        case 2-1: System.out.print(“v “);
        break;
        case ‘d’-‘a’: System.out.print(“w “);
        break;
        case 0: System.out.print(“x “);
        break;
        case ~0: System.out.print(“y “);
        break;
        case 4&5: System.out.print(“z “);
        break;
        default: System.out.print(“Default “);
      }
    }
  }
}

What is the result of attempting to compile and run the above program?

class TechnoSample {
  public static void main (String args[]) {
    int i = 0;
    int j = 0;
label1:
    while (i++<5) {
label2:
      for (;;) {
label3:
        do {
          System.out.print(i + j);
          switch (i+j++) {
            case 0: continue label3;
            case 1: continue label2;
            case 2: continue label1;
            case 3: break;
            case 4: break label3;
            case 5: break label2;
            case 6: break label1;
            default: break label1;
          }
        } while (++j<5);
      }
    }
  }
}

What is the result of attempting to compile and run the above program?

1. class A {
2.   void m1() {throw new ArithmeticException();}
3.   void m2() {throw new ClassCastException();}
4.   void m3() {throw new IllegalArgumentException();}
5.   void m4() {throw new IndexOutOfBoundsException();}
6.   void m5() {throw new NullPointerException();}
7.   void m6() {throw new SecurityException();}
8. }

What is the result of attempting to compile the program?

class Level1Exception extends Exception {}
class Level2Exception extends Level1Exception {}
class Level3Exception extends Level2Exception {}

class Purple {
  public static void main(String args[]) {
    int a,b,c,d,f,g,x;
    a = b = c = d = f = g = 0;
    x = 3;
    try {
      try {
        switch (x) {
          case 1: throw new Level1Exception();
          case 2: throw new Level2Exception();
          case 3: throw new Level3Exception();
        }
        a++;
      }
      catch (Level2Exception e) {b++;}
      finally{c++;}
    }
    catch (Level1Exception e) { d++;}
    catch (Exception e) {f++;}
    finally {g++;}
    System.out.print(a+”,”+b+”,”+c+”,”+d+”,”+f+”,”+g);
  }
}

What is the result of attempting to compile and run the program?

class A {

  public static void main (String args[]) {
    int h = 0, i = 0, j = 0, k = 0;

label1:
    for (;;) {
      h++;

label2:
      do {
        i++;
        k = h + i + j;

        switch (k) {
          default: break label1;
          case 1: continue label1;
          case 2: break;
          case 3: break label2;
          case 4: continue label2;
          case 5: continue label1;
        }
      } while (++j<5);
    }
    System.out.println(h + “,” + i + “,” + j);
  }
}

What is the result of attempting to compile and run the above program?

public 
protected 
private

1: public class Q1 extends Thread
2: {
3:    public void run()
4:    {
5:       System.out.println(“Before start method”);
6:       this.stop();
7:       System.out.println(“After stop method”);
8:    }
9:
10:   public static void main(String[] args)
11:   {
12:      Q1 a = new Q1();
13:      a.start();
14:   }
15: }

1     class Test
2     {
3          void show()
4          {
5              System.out.println(“non-static method in Test”);
6          }
7     }
8     public class Q3 extends Test
9     {
10       static void show()
11       {
12           System.out.println(“Overridden non-static method in Q3”);
13       }
14 
15       public static void main(String[] args)
16       {
17           Q3 a = new Q3();
18       }
19    }

1    if( new Boolean(“true”) == new Boolean(“true”))
2        System.out.println(“True”);
3    else
4        System.out.println(“False”);

public class Rand {
    public static void main(String argv[]) {
        int iRand;
        iRand = Math.random();
        System.out.println(iRand);
    }
} // Rand

1:    Double a = new Double(Double.NaN);
2:    Double b = new Double(Double.NaN);
3:
4:    if( Double.NaN == Double.NaN )
5:       System.out.println(“True”);
6:    else
7:       System.out.println(“False”);
8:
9:    if( a.equals(b) )
10:      System.out.println(“True”);
11:   else
12:      System.out.println(“False”);

1     public class Q11
2     {
3         static String str1 = “main method with String[] args”;
4         static String str2 = “main method with int[] args”;
5 
6         public static void main(String[] args)
7         {
8             System.out.println(str1);
9         }
10 
11        public static void main(int[] args)
12        {
13            System.out.println(str2);
14        }
15     }

1 int i = 16;
2 int j = 17;
3
4 System.out.println(“i >> 1  =  ” + (i >> 1));
5 System.out.println(“j >> 1  =  ” + (j >> 1));

1  int i = 45678;
2  int j = ~i;
3
4  System.out.println(j);

1  void infiniteLoop()
2  {
3      byte b = 1;
4
5      while ( ++b > 0 )
6          ;
7      System.out.println(“Welcome to Java”);
8  }

class A {}
class B extends A {}

public class C 
{
	public static void main(String[] args)
	{
		A[] arrA;
		B[] arrB;

		arrA = new A[10];
		arrB = new B[20];

		arrA = arrB; // (1)
		arrB = (B[]) arrA; // (2)

		arrA = new A[10];
		arrB = (B[]) arrA; // (3)
	}
}

Select one right answer.

public class Boxes{
    String sValue;

    Boxes(String sValue){
    this.sValue=sValue;
    }
    
    public String getValue(){
    return sValue;
    }

    public boolean equals(Object o){
    String s = (String) o;
    if (sValue.equals(s) ){
        return true;
    }else{
        return false;
    }


    }

    public int hashCode(){
    return sValue.hashCode();

    }
}

Which of the following statements are true?

public class TechnoExample
{
    int xyz = 22;
    …

    public void static main(String junkArgs[])
    {
        …
    }
}

While one of the following statements is true? Select one correct
answer.