# Why loops? 🤔And loops in Java.

Let's say I tell you to print something like this.

```
*
``` 
Then the simplest way to do that would be this

``` java
System.out.println("*");
``` 

But my friend if I want you to print something like this
```
*
*
``` 
You will definitely do this 

``` java
System.out.println("*");
System.out.println("*");
``` 

Now I want you to print the star 1000 times. Then using the `System.out.println("*"); `
is not a good option.

A great person said that -

> A  good  code  is  code  that  does  not  repeat  itself.

That leads to the ** creation of loops** so that we can do the repetitive work efficiently, with a little amount of coding.

General inputs in the case of loops are -> 

1. Initialization: It is the initial condition which is executed once when the loop starts. Here, we can initialize the variable, or we can use an already initialized variable. It is an optional condition.
2. Condition: It is the second condition which is executed each time to test the condition of the loop. It continues execution until the condition is false. It must return boolean value either true or false. It is an optional condition.
3. Increment/Decrement: It increments or decrements the variable value. It is an optional condition.
4. Statement: The statement of the loop is executed each time until the second condition is false.




Different types of loops in Java :

-  for loop in Java


![Screenshot -09 182709.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1667998654096/IJLjW_0Oz.png align="left")
```java
for ( initialization  ; condition ; increment/ decrement ) {
    // code to be executed
    statement
}
``` 
test code

```java 
for ( int i = 0 ; i < 5 ; i++ ){
  System.out.println("*");
}
``` 
 test code output
 ```
*
*
*
*
*
```

- while loop in Java



![while.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1667999200383/Ene9lUR3x.png align="left")
```java

while ( condition ){    
//code to be executed  / statement
 increment / decrement statement  
}  

``` 
test code

```java 
int i = 0 ;
while ( i < 5 ) {
  System.out.println("*");
  i++;
}
``` 
 test code output
 ```
*
*
*
*
*
```
-  do while Loop in Java


![do.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1668000158946/E1eFMWyWZ.png align="left")
```java 
do{    
//code to be executed / statement 
 increment / decrement statement   
}while (condition);  
``` 

```java 
int i = 0 ;
do {
System.out.println("*");
i++;
} while ( i < 5 );
``` 
 test code output
 ```
*
*
*
*
*
```


Hope it was help full, see you in the next Blog.
Till then , bye bye 👋.