if-else
statement: - This statement is useful to execute a task. Task means 1 or more
statements depending upon whether a condition is true or not.this statement
execute only one time
Syntax: - if(condition)
{
Statements 1;
}
else
{
Statements 2;
}
Example
Program:-
public class IfCondition {
public static void main(String args[])
{
int a=30,b=20;
if(a>b)
{
System.out.println("a is
greater");
}
else{
System.out.println("b is
greater");
}
}
}
switch statement: -
switch statement is useful to execute a particular task from several available
tasks depending upon the value of a variable.
Break
is statement to come out from a switch statement.
Switch
statement is useful to handle menu driven programs. Menu means a list of items
or options for the user select.
Syntax:
-
switch(var)
{
case value1:
Statements 1;
break;
case value2:
Statements 2;
break;
|
|
case value n:
Statements n;
break;
default :
Statements;
}
Example
Program:-
public
class Switch_Statement {
public static void main(String a[])
{
char item='c';
switch(item){
case 'p':
System.out.println("pen");
break;
case 'c':
System.out.println("computer");
break;
case 'b':
System.out.println("book");
break;
default:
System.out.println("no
item");
}
}
}
break
statement: -
it is useful to come out of a loop. it is
useful to come out of a switch statement.
it is used in a nested blocks to go to end of
a block
Syntax: -
break blockname;
Example
Program:-
public class Break_Statement {
public static void main(String a[]){
int i;
for(i=1;i<=10;i++){
if(i>5){
break;
}
System.out.println(+i);
}
}
}
Continue
statement: -
This statement is useful to continue
the next repetition of a loop. When the statement will subsequent statements in
the loop are not executed.
Example
Program:-
public class Continue_state {
public static void main(String a[]){
int i;
for(i=1;i<=10;i++){
if(i<5){
continue;
}
System.out.println(+i);
}
}
}
return
statements: - it is used in 2 ways.
1) It is used to come out of a
method to a calling method.
Note:
- If return is used in main the entire program is terminated.
2) return statement can be used to
return some value to the calling method.
Example
program: -
public class
Return1_Statement {
public static void main(String args[])
{
BankAccount ba=new BankAccount();
ba.input("narendar",50000);
ba.deposit(10000);
ba.display();
}
}
class BankAccount{
int balance,total;
String acc_name;
void input(String acc_name,int balance){
this.acc_name=acc_name;
this.balance=balance;
}
int deposit(int amt){
total=amt+balance;
return total;
}
void display(){
System.out.println("account name
:"+acc_name);
System.out.println("Balance
:"+total);
}
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