OCJP Online Test Series 4 | OCJP Quiz | SCJP Quiz | Java Online Test

Which one statement is true?

public class Threads5 {
public static void main (String[] args) {
new Thread(new Runnable() {
public void run() {
System.out.print(“bar”);
}}).start();
}
}

What is the result?

Given that t1 is a reference to a live thread, which is true?

Given:
void waitForSignal() {
Object obj = new Object();
synchronized (Thread.currentThread()) {
obj.wait();
obj.notify();
}
}

Which statement is true?

class X {
X() { System.out.print(1); }
X(int x) {
this(); System.out.print(2);
}
}
public class Y extends X {
Y() { super(6); System.out.print(3); }
Y(int y) {
this(); System.out.println(4);
}
public static void main(String[] a) { new Y(5); }
}

What is the result?

package com.sun.scjp;
public class Geodetics {
public static final double DIAMETER = 12756.32; // kilometers
}
Which one correctly access the DIAMETER member of the Geodetics class?

import java.util.*;
public class Explorer1 {
public static void main(String[] args) {
TreeSet s = new TreeSet();
TreeSet subs = new TreeSet();
for(int i = 606; i < 613; i++)
if(i%2 == 0) s.add(i);
subs = (TreeSet)s.subSet(608, true, 611, true);
s.add(609);
System.out.println(s + ” ” + subs);
}
}

What is the result?

Given:
Runnable r = new Runnable() {
public void run() {
System.out.print(“Cat”);
}
};
Thread t = new Thread(r) {
public void run() {
System.out.print(“Dog”);
}
};
t.start();

What is the result?

HashMap props = new HashMap();
props.put(“key45”, “some value”);
props.put(“key12”, “some other value”);
props.put(“key39”, “yet another value”);
Set s = props.keySet();
// insert code here
What, inserted at line 39, will sort the keys in the props HashMap?

Given:

String #name = “Jane Doe”;
int $age = 24;
Double _height = 123.5;
double ~temp = 37.5;

Which one statement is true?

abstract public class Employee {
protected abstract double getSalesAmount();
public double getCommision() {
return getSalesAmount() * 0.15;
}
}
class Sales extends Employee {
// insert method here
}
Which one method, inserted independently at line 17, correctly complete the Sales class?

public class TestOne implements Runnable {
public static void main (String[] args) throws Exception {
Thread t = new Thread(new TestOne());
t.start();
System.out.print(“Started”);
t.join();
System.out.print(“Complete”);
}
public void run() {
for (int i = 0; i < 4; i++) {
System.out.print(i);
}
}
}

What can be a result?

class One {
void foo() { }
}
class Two extends One {
//insert method here
}
Which one method, inserted individually at line 14, will correctly complete class Two?

import java.util.*;
public class Quest {
public static void main(String[] args) {
String[] colors = {“blue”, “red”, “green”, “yellow”, “orange”};
Arrays.sort(colors);
int s2 = Arrays.binarySearch(colors, “orange”);
int s3 = Arrays.binarySearch(colors, “violet”);
System.out.println(s2 + ” ” + s3);
}
}

What is the result?

public class A {
public void doit() {
}
public String doit() {
return “a”;
}
public double doit(int x) {
return 1.0;
}
}

What is the result?

class Test{
static void test() {
try {
String x = null;
System.out.print(x.toString() + ” “);
}
finally { System.out.print(“finally “); }
}
public static void main(String[] args) {
try { test(); }
catch (Exception ex) { System.out.print(“exception “); }
}
}

What is the result?

Given:
interface Animal { void makeNoise(); }
class Horse implements Animal {
Long weight = 1200L;
public void makeNoise() { System.out.println(“whinny”); }
}
public class Icelandic extends Horse {
public void makeNoise() { System.out.println(“vinny”); }
public static void main(String[] args) {
Icelandic i1 = new Icelandic();
Icelandic i2 = new Icelandic();
Icelandic i3 = new Icelandic();
i3 = i1; i1 = i2; i2 = null; i3 = i1;
}
}
When line 15 is reached, how many objects are eligible for the garbage collector?

public class Pass2 {
public void main(String [] args) {
int x = 6;
Pass2 p = new Pass2();
p.doStuff(x);
System.out.print(” main x = ” + x);
}

void doStuff(int x) {
System.out.print(” doStuff x = ” + x++);
}
}

And the command-line invocations:
javac Pass2.java
java Pass2 5

What is the result?

class TestException extends Exception { }
class A {
public String sayHello(String name) throws TestException {
if(name == null) throw new TestException();
return “Hello ” + name;
}
}
public class TestA {
public static void main(String[] args) {
new A().sayHello(“Aiko”);
}
}
Which statement is true?

public class Donkey {
public static void main(String[] args) {
boolean assertsOn = false;
assert (assertsOn) : assertsOn = true;
if(assertsOn) {
System.out.println(“assert is on”);
}
}
}

What is result?