Oracle Java Certification Exams (OCAJP) Mock Exam Part2

Please select correct output for below code?

package com.knowledgewala.sample;

public class KWSampleForSCJP implements Runnable {

    public void run() {
        System.out.println("run.");
        throw new RuntimeException("Problem");
    }

    public static void main(String[] args) {
        Thread t = new Thread(new KWSampleForSCJP());
        t.start();
        System.out.println("End of method.");
    }
}

Which two statements are true?

What is the result?

package com.knowledgewala.sample;

public class KWSampleForSCJP {

    public static void main(String args[]) {
        class Foo {
            public int i = 3;
        }
        Object o = (Object) new Foo();
        Foo foo = (Foo) o;
        System.out.println("i = " + foo.i);
    }
}

Which statement is true?

Which statement at Point X on line 1 is required to allow this code to compile?

package com.knowledgewala.sample;
//Point X
public class KWSampleForSCJP {

    public static void main(String[] args) throws Exception {
        jave.io.PrintWriter out = new jave.io.PrintWriter(new jave.io.OutputStreamWriter(System.out), true);
        out.println("Hello");
    }
}

What is the numerical range of a byte?

What is the decimal value of j at line 7?

package com.knowledgewala.sample;

public class KWSampleForSCJP {

    public static void main(String args[]) {
        int i = 0xFFFFFFF1;
        int j = ~i;

    }
}

Which two expressions evaluate to True?

Integer i = new Integer (42);
Long 1 = new Long (42);
Double d = new Double (42.0);

What is the result of below code?

package com.knowledgewala.sample;

public class KWSampleForSCJP {

    private static int j = 0;

    private static boolean methodB(int k) {
        j += k;
        return true;
    }

    public static void methodA(int i) {
        boolean b;
        b = i < 10 | methodB(4);
        b = i < 10 || methodB(8);
    }

    public static void main(String[] args)

    {
        methodA(0);
        System.out.println(j);
    }
}

Which statement is true?

package com.knowledgewala.sample;

public class KWSampleForSCJP {

    public static void main(String[] args)

    {
        byte b = 127;
        byte c = 126;
        byte d = b + c;
    }
}

Which statement is true?

What is the acceptable type for the variable i?

switch (i) {
         default:
         System.out.println("Hello");
        }

You need to store elements in a collection that guarantees that no duplicates are stored.
Which two interfaces provide that capability?

What happens when this code gets executed?

package com.kw.sample;

import java.util.SortedSet;
import java.util.TreeSet;

public class KWSampleForOCPJP {

    public static void main(String… args) {
        SortedSet<Integer> set = new TreeSet<Integer>();
        set.last();
    }

}

What happens when this code gets executed?

package com.kw.sample;

import java.util.SortedSet;
import java.util.TreeSet;

public class KWSampleForOCPJP {

    public static void main(String... args) {
        SortedSet<Integer> set = new TreeSet<Integer>();
        set.add(7);
        set.add(-12);
        SortedSet<Integer> sub = set.subSet(-100, 100);
        sub.add(9);
        System.out.format("%d %d", set.size(), sub.size());
    }

}

NavigableSet extends SortedSet.

What is the output of this code?

package com.kw.sample;

import java.util.NavigableSet;
import java.util.TreeSet;

public class KWSampleForOCPJP {

    public static void main(String... args) {
        NavigableSet<Integer> set = new TreeSet<Integer>();
        set.add(-12);
        set.add(24);
        System.out.format("%d %d %d %d", set.lower(-12), set.lower(0),
                set.lower(24), set.lower(100));
    }
}

Consider List<E>. What is the signature of the method set?

Which are true?

package com.kw.sample;

public class KWSampleForOCPJP {

    static String s;
    static Boolean b;

    static Boolean t1() {
        return new Boolean(“howdy”);
    }

    static boolean t2() {
        return new Boolean(s);
    }

    public static void main(String[] args) {
        if (t1())
            System.out.print(“t1 “);
        if (!t2())
            System.out.print(“t2 “);
        if (t1() != t2())
            System.out.print(“!= “);
    }
}

What is the result of compiling and running the following code?

package com.kw.sample;

public class KWSampleForOCPJP {

    public static void main(String[] args) {
        int x = 0;
        int i = 1;
        for (; i > 0; i–)
            if ((++x > 0) | (–i > 0))
                x++;
        System.out.println(x + “” + i);
    }
}

What is the result of compiling and running the following code?

package com.kw.sample;

public class KWSampleForOCPJP {

    public static void main(String[] args) {
        System.out.print("4" + 5);
        System.out.print(4 + 5);
        System.out.print(4 + 5 + "9");
    }
}

Would the following code compile and run?

package com.kw.sample;

public class KWSampleForOCPJP {

    public static void main(String args) {
        System.out.println("JavaChamp");
    }
}

What is the possible results of compiling and running the following code?

package com.kw.sample;

public class KWSampleForOCPJP {

    static Runnable t1 = new Runnable() {
        public void run() {
            try {
                System.out.print("t1before");
                Thread.sleep(100);
                System.out.print("t1after");
            } catch (InterruptedException e) {
            }
        }
    };
    static Thread t2 = new Thread() {
        public void run() {
            try {
                System.out.print("t2before");
                synchronized (this) {
                    wait();
                }
                System.out.print("t2after");
            } catch (InterruptedException e) {
            }
        }
    };

    public static void main(String[] args) throws InterruptedException {
        new Thread(t1).start();
        t2.start();
    }
}

Which of the following are methods of the Thread class?