public class Parent {
static final String str = "I am parent class variable";
static String str2 = "I am child class variable";
public static void childMethod() {
int var = 20;
System.out.println(str);
System.out.println("Variable integer value is "+var);
System.out.println(str2);
}
public static void main(String[] args) {
Parent.childMethod();
}
}
ANS:
I am parent class variable
Variable integer value is 20
I am child class variable
=============================================================================
public class switchMember {
void switchNumber(long number) {
switch(number) {
case 1.0:
System.out.println("floating point");
case 1:
System.out.println("Integer ");
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
switchMember s = new switchMember();
s.switchNumber(1l);
}
ANS:
Cannot switch on a value of type long. Only convertible int values, strings
or enum variables are permitted
=============================================================================
public class Test1 {
static boolean b1;
static Boolean b2;
static boolean[] a1 = new boolean[1];
static Boolean[] a2 = new Boolean[1];
public static void main(String[] args) {
Boolean check;
if(b1||b2)
check = a1[0] = a2[0];
else if (b1&&b2)
check = a2[0] = a1[0];
else
check = a1[0] == a2[0];
System.out.println(check);
}
ANS:
Exception in thread "main" java.lang.NullPointerException: Cannot invoke
"java.lang.Boolean.booleanValue()" because "assessment.Test1.b2" is null
at assessment.Test1.main(Test1.java:10)
=============================================================================
import java.util.ArrayList;
import java.util.List;
class A{}
class B extends A{}
class C extends B{}
public class Test2 {
public static void main(String[] args) {
List<? super B> l1 = new ArrayList<>();
List<? extends B> l2 = new ArrayList<>();
ANS:
l1.add(new C());
=============================================================================
public class Test3 {
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(MIN_VALUE);
}
ANS :
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
MIN_VALUE cannot be resolved to a variable
=============================================================================
public class Thread0 extends Thread{
public void run() {
System.out.println(Thread.currentThread().getName());
}
public static void main(String[] args) {
Thread0 t2 = new Thread0();
t2.start();
}
}
ANS :
Thread-0
=============================================================================
public class ThreeLoop {
public static void main(String[] args) {
// TODO Auto-generated method stub
int n = 5;
int s = 0;
for(int i =0; i<n;i++) {
for(int j =i; j<n;j++) {
for(int k=j; k<n;k++) {
s++;
}
}
}
System.out.println(s);
}
}
ANS :
35
=============================================================================
public class TwoLoop {
public static void main(String[] args) {
// TODO Auto-generated method stub
int n = 10;
int sum = 0;
for(int i =0; i<n;i++) {
for(int j =i; j<n;j++) {
sum += i+j;
}
}
System.out.println(sum);
}
ANS :
495
=============================================================================
import java.util.regex.Pattern;
class ABC {
public static void main(String[] args) {
String text="Hello1how2are3you4";
String delimiter="\\d";
Pattern pattern=Pattern.compile(delimiter,Pattern.CASE_INSENSITIVE);
String[] result=pattern.split(text);
for(String temp:result)
System.out.println(temp);
ANS:
Hello
how
are
you
=============================================================================
public class EigthQuestion {
public static void main(String[] args) {
int n=5;
int[][] a=new int[n][n];
int count=0;
for(int i=0;i<n;i++) {
for(int j=0;j<n;j++) {
a[i][j]=count++;
}
}
System.out.println(a[2][3] + a[4][1]);
}
Ans: 34
=============================================================================
public class FirstQuestion implements Runnable{
public static void main(String[] args) {
FirstQuestion obj = new FirstQuestion();
Thread t = new Thread(obj);
t.start();
System.out.println("Java");
try {
t.join();
}
catch(InterruptedException ie) {
ie.printStackTrace();
}
System.out.println("Prog");
@Override
public void run() {
System.out.println("Welcome ");
System.out.println("To ");
Ans :
Java
Welcome
To
Prog
=============================================================================
public class FourthQuestion {
public static void main(String[] args) {
int x=5;
int y=7;
int z=3;
if(x>y) {
if(x>z) {
System.out.println("x");
}
else {
System.out.println("z");
}
}else {
if(y>z) {
System.out.println("z");
}
else {
System.out.println("y");
}
}
Ans: z
=============================================================================
class Master{
final public void show() {
System.out.println("Master::show() called");
}
}
class branch extends Master{
}
class Main {
public static void main(String[] args) {
Master b=new branch();
b.show();
Ans: Runs But Compile Error
=============================================================================
public class NinethQuestion extends Thread {
public void run() {
System.out.println(Thread.currentThread().getName());
}
public static void main(String[] args) {
NinethQuestion n1 = new NinethQuestion();
NinethQuestion n2 = new NinethQuestion();
NinethQuestion n3 = new NinethQuestion();
n1.start();
n2.start();
n3.start();
}
Ans: Thread-1
Thread-0
=============================================================================
public class SeventhQuestion {
static boolean b1;
static Boolean b2;
static boolean[] a1=new boolean[1];
static Boolean[] a2=new Boolean[1];
public static void main(String[] args) {
Boolean check;
if(b1 || b2)
check = a1[0]=a2[0];
else if(b1 && b2)
check = a2[0]=a1[0];
else
check = a1[0]==a2[0];
System.out.println(check);
}
Ans: Null Pointer exception or Run time Error
=============================================================================
public class SixthQuestion extends Thread{
public void run() {
System.out.println(Thread.currentThread().getName());
}
public static void main(String[] args) {
SixthQuestion s=new SixthQuestion();
s.start();
Ans: Thread-0
=============================================================================
public class STtringExample {
public static void main(String[] args) {
String str=new String("person");
String s1=str.concat("Boss");
System.out.println(s1);
String s2=str.concat(s1);
System.out.println(s2);
System.out.println(str);
Ans: personBoss
personpersonBoss
person
=============================================================================
class Faculty{
float salary=30000;
}
public class TenthQuestion extends Faculty {
float bonus=2000;
public static void main(String[] args) {
// var v1=null;// Line
// var v2=0,v3=1;// Line2
// var v4= 1L + 1F;// Line3
// Ans: Line3 only
TenthQuestion ts = new TenthQuestion();
System.out.println("Salary is: "+ts.salary);
System.out.println("Bonus is: "+ts.bonus);
//
Ans : Line3 only
