| Access Modifier | within class | within package | outside package by subclass only | outside package |
|---|---|---|---|---|
| Private | Y | N | N | N |
| Default | Y | Y | N | N |
| Protected | Y | Y | Y | N |
| Public | Y | Y | Y | Y |
Loops :
A loop statement allows us to execute a statement or group of
statements multiple times and following is the general form of a loop
statement in most of the programming languages.
1. While loop :- Repeats a statement or group of statements while a given condition is true. It tests the condition before executing the loop body.
Syntax :
while (boolean condition)
{
// loop statement.....
}
Example :
Class Technogeeks
{
public static void main(String arg[])
{
int x=1;
while (x<=4)
{
System.out.println("Value of x is" +x);
x++;
}
}
}
2. do While loop :- Like a while statement, except that it tests the condition at the end of the loop body.
Syntax :
do
{
// Ststements......
}
while (condition);
Example :
class Technogeeks
{
public static void main(String args[])
{
int x = 21;
do
{
System.out.println("Value of x is" +x);
x++;
}
while (x<20);
}
}
3. For loop :- Execute a sequence of statements multiple times and abbreviates the code that manages the loop variable.
Syntax :
for(initialization condition; texting condition ; increment/decrement)
{
//Statements
}
Example :
Class Technogeeks
{
public static void main (String args[])
{
for(int x=2; x<=4; x++)
System.out.println("Value of x is " +x);
}
}
Infinite Loop
Example :
public class Technogeeks
{
public static void main(String[] args)
{
for(int i=5; i!=0; i -=2)
{
System.out.println(i);
}
int x=5;
While(x==5)
{
System.out.println("In the loop");
}
}
Condition: if statement is used to test the condition. It checks boolean condition: true or false. There are various types of if statement in Java.
If Statement
Syntax :
If(condition)
{
//Statement OR code to be executed
}
Example :
Public class ifExample
{
Public static void main(String[] args)
{
Int age =20;
If(age>18)
{
System.out.println(“Age is greater than 18”);
}
}
}
2. If-else Statement
Syntax :
If(condition)
{
//code if condition is true
}
Else
{
// code if condition is false
}
Example :
Public classs ifElseExample
{
Public static void main(String [] args)
{
Int number = 13;
If(number%2==0)
{
System.out.println(“even number”);
}
Else
{
System.out.println(“odd number”);
}
}
}
Leap Year
A year is leap, if it is divisible by 4 and 400. But, not by 100.
Public class leapyear
{
Public static void main(String[] args)
{
Int year =2020;
If(year%4==0) && (year%100!=0) || (year% 400==0)
{
System.out.println(“LEAP YEAR”);
}
Else
{
System.out.println(“COMMON YEAR”);
}
}
}
3. If-else-if : The if-else-if ladder statement executes one condition from multiple statements.
Syntax :
If(condition)
{
//code to be executed if condition1 is true
}
Else if(condition)
{
//code to be executed if condition2 is true
}
Else
{
//code to executed if all condition are false
}
Example :
Public class ifelseifexample{
Public static void main(String[] args){
Int marks =65;
If(marks<50){
System.out.println(“Fail”);
}
Elseif(marks>=60 && marks<70){
System.out.println(“D grade”)
}
Elseif(marks>=70 && marks<80){
System.out.println(“B grade”);
} Elseif(marks>=80 && marks<90){
System.out.println(“c grade”);
}else{
System.out.println(“Invaild”);
}
}
}
WRP to check positive, negative and zero?
Public class positivenegative
{
Public static void main(String[] args)
{
Int number = -15;
If(number>0)
{
System.out.println(“POSITIVE”);
}
Elseif(number<0)
{
System.out.println(“NEGATIVE”);
}
Else{
System.out.println(“ZERO”);
}
}
}
4. Nested if Statement
Syntax :
If(condition){
//code to executed
}
If(condition){
//code to be excuted
}
Example :
Publiuc class nestedif{
Public static void main(Strings[] args)
{
Int age=20;
Int weight=80;
If(age>=18){
If(weight>50)
{
System.out.println(“Your are eligible to donate blood”);
}
}
}
}
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