Loop Android Studio in Java

 Loop

In Java, a loop is a control structure that allows a certain block of code to be executed repeatedly as long as a specified condition is true. There are three main types of loops in Java: `for`, `while`, and `do-while`. Here's a brief overview of each, along with a loop specification table and examples:

1. For Loop:

 

for (initialization; condition; update) {// Code to be

//repeated code here }

•     Initialization: Executed once at the beginning.
•     Condition: Evaluated before each iteration. If false, the loop exits.
•     Update: Executed after each iteration.

Example:

for (int i = 1; i <= 5; i++) {
System.out.println("Iteration " + i);
}

 

2. While Loop:

while (condition) {
// Code to be repeated
}

• Condition: Evaluated before each iteration. If false, the loop exits.

   Example:

int count = 1;

while (count <= 5) {
System.out.println("Iteration " + count);
count++;
}

3. Do-While Loop:

do {

// Code to be repeated
} while (condition);

   - Code is executed at least once, even if the condition is false.

   - Condition: Evaluated after each iteration. If false, the loop exits.

   Example:

int count = 1;
do {
System.out.println("Iteration " + count);
count++;
} while (count <= 5);

Loop Specification Table:

In Java, a loop is a control structure that allows a certain block of code to be executed repeatedly as long as a specified condition is true. There are three main types of loops in Java: for, while, and do-while. Here's a brief overview of each, along with a loop specification table and examples:

1. For Loop:

   java
   for (initialization; condition; update) {
       // Code to be repeated
   }
   

   • Initialization: Executed once at the beginning.
   • Condition: Evaluated before each iteration. If false, the loop exits.
   • Update: Executed after each iteration.

   Example:

   java
   for (int i = 1; i <= 5; i++) {
       System.out.println("Iteration " + i);
   }
   

2. While Loop:

   java
   while (condition) {
       // Code to be repeated
   }
   

   • Condition: Evaluated before each iteration. If false, the loop exits.

   Example:

   java
   int count = 1;
   while (count <= 5) {
       System.out.println("Iteration " + count);
       count++;
   }
   

3. Do-While Loop:

   java
   do {
       // Code to be repeated
   } while (condition);
   

   • Code is executed at least once, even if the condition is false.
   • Condition: Evaluated after each iteration. If false, the loop exits.

   Example:

   java
   int count = 1;
   do {
       System.out.println("Iteration " + count);
       count++;
   } while (count <= 5);
   

Loop Specification Table:

Loop Type	Initialization	Condition	Update (After each iteration)	Execution Flow
for loop	Executed once	Evaluated before	Executed after each iteration	Initialization → Condition check → Code execution → Update → Repeat
while loop	N/A	Evaluated before	N/A	Condition check → Code execution → Repeat until condition is false
do-while loop	N/A	Evaluated after	N/A	Code execution → Condition check → Repeat until condition is false

These loops provide different ways to control the flow of your program and execute code repeatedly based on specified conditions.

For Loop Example

XML code

<EditText
android:id="@+id/inptOne"
android:layout_width="match_parent"
android:layout_height="100dp"
android:hint="text one"
android:padding="20dp"
android:textSize="25sp"
android:textColor="@color/white"/>

<EditText
android:id="@+id/inptTwo"
android:layout_width="match_parent"
android:layout_height="100dp"
android:hint="text one"
android:padding="20dp"
android:textSize="25sp"
android:textColor="@color/white"/>

<Button
android:id="@+id/btnClick"
android:layout_width="250dp"
android:layout_height="100dp"
android:text="Click"
android:textSize="25dp"
android:backgroundTint="#878080"
/>

<TextView
android:id="@+id/tvDisplay"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:textColor="@color/white"
/>

Java Code

nptOne = findViewById(R.id.inptOne);
nptTwo = findViewById(R.id.inptTwo);
btnClick = findViewById(R.id.btnClick);
tvDisplay = findViewById(R.id.tvDisplay);

btnClick.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String sOneInp = nptOne.getText().toString();
String sTwoInp = nptTwo.getText().toString();

if (nptOne.length()>0 && nptTwo.length()>0){

int Input1 = Integer.parseInt(sOneInp);
int Input2 = Integer.parseInt(sTwoInp);

for (int x = Input1; x<=Input2; x++){
if (x%2==0) tvDisplay.append(""+x);
}

}
}
});

Now This Output