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- Java Loops
- Do-While Loop
- Java While Loop
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- Abstract class in Java
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Hibernate
- Hibernate 5 hello world
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- Introduction Of Java strutes to Architecture
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Java Loops
Loops are used to execute a set of functionality again and again till the condition turn into accurate. In java, there are three types of loops:
- for loop
- while loop
- do-while loop
The for loop statement is the most used, but while and do-while have their uses as well.
for loop
In java for loop is used to repeat the part of the program many times. If the number of repetition is fixed, then for loop is use.
while loop
In java while loop is used to repeat the part of the program many times. If the number of repetition is not fixed, then while loop is use.
do-while loop
In java do-while loop is used to repeat the part of the program many times. If the number of repetition is not fixed and need to execute loop at least once.
For Loop
In java for loop is used to repeat the part of the program many times. If the number of repetition is fixed, then for loop is use. For loop is recommended for iterating on objects like arrays and lists that can be counted.
Syntax
for(initialization; condition ; increment/decrement)
{
statement(s);
}
Flowchart
-
Initialization
An initialization expression that sets the initial value of the counter used by this loop. It executes only once when the loop starts.
-
Condition
It execute each time to test the condition. In condition of the loop, as long as this condition is evaluated to true, the loop will continue executing.
-
Statement
In statement, it executed every time until the second condition is false.
-
Increment/Decrement
Example
class ForExample {
public static void main(String[] args) {
//Code of Java for loop
for(int i=1;i<=8;i++){
System.out.println(i);
}
}
}
Output
1
2
3
4
5
6
7
8
Nested for Loop
When for loop is inside of another loop, then it is called nested for loop. Whenever outer loop executes inner loop also executes completely.
Example
class NestedForloop {
public static void main(String[] args) {
//loop of i
for(int i=A;i<=C;i++){ //loop of j
for(int j=A;j<=C;j++){
System.out.println(i+” “+j);
} //end of i
} //end of j
}
}
Output
A A
A B
A C
B A
B B
B C
C A
C B
C C
Pyramid Example
class PyramidExample {
public static void main(String[] args) {
for(int i=1;i<=6;i++){
for(int j=1;j<=i;j++){
System.out.print(“1 “);
}
System.out.println(); //new line
}
}
}
Output
1
1 1
1 1 1
1 1 1 1
1 1 1 1 1
1 1 1 1 1 1
For-each Loop
For-each loop is used to navigate array. It is easy to use than simple for loop. It does not need to increment value and use subscript notation.
It deals with components premise, not file. It returns component individually in the characterized variable.
Syntax
for(Type var:array){
//code to be executed
}
Example
class ForEachExample {
public static void main(String[] args) { //Declare an array
int arr[]={11,22,33,44,55}; //Print array using for-each loop
for(int i:arr){
System.out.println(i);
}
}
}
Output
11
22
33
44
55
Infinitive for Loop
Use of two semicolons ; ; in for loop is called infinitive for loop.
Syntax
for(; ;){
//code to be executed
}
Example
class ForExample {
public static void main(String[] args) {
//Using no condition in for loop
for(;;){
System.out.println(“infinitive for loop”);
}
}
}
Output
infinitive loop
infinitive loop
infinitive loop
infinitive loop
infinitive loop
ctrl+c
Ctrl+c is use to exit the program
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