Oracle Java Certification Exams (OCAJP) Mock Exam Part1

What is the result?

int[] array = { 1, 2, 3, 4, 5, 6 };
        int i = array.length - 1;

        while (i >= 0) {
            System.out.print(a[i]);
            i--;
        }

What is the output for the below code?

public class A {

            int add(int i, int j) {

                return i + j;

            }
        }
        public class B extends A {

            public static void main(String argv[]) {

                short s = 9;

                System.out.println(add(s, 6));

            }
        }

What is the expected output?

public class KWSampleForOCPJP {

    public static void main(String[] args) {
        boolean stmt1 = "knowledgewala" == "knowledgewala";
        boolean stmt2 = new String("knowledgewala") == "knowledgewala";
        boolean stmt3 = new String("knowledgewala") == new String(
                "knowledgewala");
        System.out.println(stmt1 && stmt2 || stmt3);
    }

}

What notifyAll() method do?

Read this piece of code carefully, Please select correct Answer?

if("String".toString() == "String")
System.out.println("Equal");
else
System.out.println("Not Equal");

Read the code below. Will be the result of attempting to compile and run the code below.

public class KWSampleForSCJP {

    public void method(Object o) {
        System.out.println("Object Verion");
    }

    public void method(String s) {
        System.out.println("String Version");
    }

    public static void main(String args[]) {
        KWSampleForSCJP kwSampleForSCJP = new KWSampleForSCJP();
        kwSampleForSCJP.method(null);
    }

}

Read the following code below, please select correct answer?

public interface KWSampleForSCJP {
    public abstract void someMethod() throws Exception;
}

A Class implementing this interface should

An Interface can never be private or protected.

Please select correct answer?
public class KWSampleForSCJP {

    private int i = j;
    private int j = 10;

    public static void main(String args[]) {
        System.out.println((new KWSampleForSCJP()).i);
    }

}

Please select correct output of below code –

public class KWSampleForSCJP {

    public static void main(String args[]) {
        System.out.println(“Before Try”);
        try {
        } catch (Throwable t) {
            System.out.println(“Inside Catch”);
        }
        System.out.println(“At the End”);
    }

}

The class java.lang.Exception

Please select correct answer for the following lines of code

byte b = 0;
b += 1;

Please select the correct output of the below code –
public class KWSampleForSCJP {

    private void method1() throws Exception {
        throw new RuntimeException();
    }

    public void method2() {
        try {
            method1();
        } catch (RuntimeException e) {
            System.out.println("Caught Runtime Exception");
        } catch (Exception e) {
            System.out.println("Caught Exception");
        }
    }

    public static void main(String args[]) {
        KWSampleForSCJP kwSampleForSCJP = new KWSampleForSCJP();
        kwSampleForSCJP.method2();
    }
}

Which two cause a compiler error?

Please select correct output?

public class KWSampleForSCJP {

    public static void main(String args[]) {
        int i = 1, j = 10;
        do {
            if (i++ > --j) {
                continue;
            }
        } while (i < 5);
        System.out.println("i = " + i + "and j = " + j);
    }
}

Which are true about given below code?

public class KWSampleForOCPJP extends Thread {

    public static void main(String[] args) {
        Thread t = new Thread(new KWSampleForOCPJP());
        Thread t2 = new Thread(new KWSampleForOCPJP());
        t.start();
        t2.start();
    }

    public static void run() {
        for (int i = 0; i < 2; i++)
            System.out.print(Thread.currentThread().getName() + " ");
    }

}

Please choose only correct answer:

package com.kw.sample;

public class KWSampleForOCPJP extends Thread {

    static int x = 4;
    int y = 9;

    public KWSampleForOCPJP() {
        System.out.print(this.x); // line 7
        printVariables();
    }

    public static void printVariables() {
        System.out.print(x); // line 12
        System.out.print(y); // line 13
    }

    public static void main(String... args) { // line 16
        new KWSampleForOCPJP();
    }

}

What is the result?

package com.kw.sample;

import java.util.ArrayList;
import java.util.List;

public class KWSampleForOCPJP {

    class Snack {
        static List<String> s1 = new ArrayList<String>();
    }

    public static void main(String... args) { // line 16
        List<String> c1 = new ArrayList<String>();
        s1.add("1");
        s1.add("2");
        c1.add("3");
        c1.add("4");
        getStuff(s1, c1);
    }

    static void getStuff(List<String> a1, List a2) {
        for (String s1 : a1)
            System.out.print(s1 + " ");
        for (String s2 : a2)
            System.out.print(s2 + " ");
        ;
    }

}

Please select the correct answers for below code?

package com.kw.sample;

import java.util.ArrayList;
import java.util.List;

public class KWSampleForOCPJP {

    public static void main(String… args) { // line 16
        int a = 6;
        if (a = 6)
            System.out.print(“true”);
    }

}

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

package com.kw.sample;

public class KWSampleForOCPJP {

    public static void main(String... args) { // line 16
        int x = 0, y = 0;
        x = 5 + y++;
        System.out.print(x + "" + y);
        x = 0;
        y = 0;
        x = 5 + ++y;
        System.out.print(x + "" + y);
    }

}