Static in Java
Authored by DEVAKI AMIR
Computers
Professional Development
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8 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
class Test1 {
public
static void main(String[] args)
{
int x = 20;
System.out.println(x);
}
static
{
int x = 10;
System.out.print(x + " ");
}
}
class Test1 {
public
static void main(String[] args)
{
int x = 20;
System.out.println(x);
}
static
{
int x = 10;
System.out.print(x + " ");
}
}
10 20
20 10
10 10
20 20
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
class Test1 {
static int x = 10;
public
static void main(String[] args)
{
Test1 t1 = new Test1();
Test1 t2 = new Test1();
t1.x = 20;
System.out.print(t1.x + " ");
System.out.println(t2.x);
}
}
10 10
20 20
10 20
20 10
Answer explanation
static variable is class level variable. if we do update in any reference then automatically all pointing reference value are changed.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
class Test1 {
int x = 3;
public
static void main(String[] args)
{
System.out.println(x);
}
static
{
System.out.print(x + " ");
}
}
3 3
Error
Exception
None
Answer explanation
If we are trying to print the instance variable inside the static block or static method without creating class instance then it will give the error : non-static variable x cannot be referenced from a static context.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
class Test1 {
static int i = 1;
public static void main(String[] args)
{
int i = 1;
for (Test1.i = 1; Test1.i < 10; Test1.i++) {
i = i + 2;
System.out.print(i + " ");
}
}
}
1 3 9
1 2 3 … 9
3 5 7 9 11 13 15 17 19
None
Answer explanation
Here, two different i copies of variable are declared, one is static and other one is local. If we write Test1.i then, static variable is executed and if we write only i, then local variable are executed.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
class Test1 {
static int i = 1;
public static void main(String[] args)
{
for (int i = 1; i < 10; i++) {
i = i + 2;
System.out.print(i + " ");
}
}
}
3 6 9
3 6 9 …. 27
Error
Answer explanation
Here local variables are printed after execution. If we want to execute static variables, then we write Test1.i or we write Test1 object.i.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
class overload
{int x;
int y;
void add(int a){
x = a + 1;
}
void add(int a, int b){
x = a + 2;
}}
class Overload_methods{
public static void main(String args[]){
overload obj = new overload();
int a = 0;
obj.add(6);
System.out.println(obj.x);
}
}
class overload
{int x;
int y;
void add(int a){
x = a + 1;
}
void add(int a, int b){
x = a + 2;
}}
class Overload_methods{
public static void main(String args[]){
overload obj = new overload();
int a = 0;
obj.add(6);
System.out.println(obj.x);
}
}
5
6
7
8
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
class overload{
int x;
double y;
void add(int a , int b){
x = a + b;}
void add(double c , double d){
y = c + d;}
overload(){
this.x = 0;
this.y = 0;
}
}
class Overload_methods{
public static void main(String args[]){
overload obj = new overload();
int a = 2;
double b = 3.2;
obj.add(a, a);
obj.add(b, b);
System.out.println(obj.x + " " + obj.y);
}
}
class overload{
int x;
double y;
void add(int a , int b){
x = a + b;}
void add(double c , double d){
y = c + d;}
overload(){
this.x = 0;
this.y = 0;
}
}
class Overload_methods{
public static void main(String args[]){
overload obj = new overload();
int a = 2;
double b = 3.2;
obj.add(a, a);
obj.add(b, b);
System.out.println(obj.x + " " + obj.y);
}
}
6 6
6.4 6.4
6.4 6
4 6.4
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