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IfElseExamples.java
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138 lines (117 loc) · 3.44 KB
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package loopAndFlow;
public class IfElseExamples {
public static void main(String[] args) {
// Code inside If is executed only if the condition is true
if (true) {
System.out.println("Will be printed");
}
// Statement inside this condition is not executed
// if (false) { //Dead Code
// System.out.println("Will NOT be printed");// Not executed
// }
// Lets look at an example
int x = 5;
if (x == 5) {
System.out.println("x is 5");// executed since x==5 is true
}
x = 6;
if (x == 5) {
System.out.println("x is 5");// Not executed since x==5 is false
}
// If Else
// If condition is true code in if is executed, else code in else is
// executed
int y = 10;
if (y == 10) {
System.out.println("Y is 10");// executed-condn y==10 is true
} else {
System.out.println("Y is Not 10");
}
y = 11;
if (y == 10) {
System.out.println("Y is 10");// NOT executed
} else {
System.out.println("Y is Not 10");// executed-condn y==10 is false
}
// Nested else if
// The code in the first if condition that is true is executed.
// If none of the if conditions are true, then code in else is executed.
int z = 15;
if (z == 10) {
System.out.println("Z is 10");// NOT executed
} else if (z == 12) {
System.out.println("Z is 12");// NOT executed
} else if (z == 15) {
System.out.println("Z is 15");// executed. Rest of the if else are
// skipped.
} else {
System.out.println("Z is Something Else.");// NOT executed
}
z = 18;
if (z == 10) {
System.out.println("Z is 10");// NOT executed
} else if (z == 12) {
System.out.println("Z is 12");// NOT executed
} else if (z == 15) {
System.out.println("Z is 15");// NOT executed
} else {
System.out.println("Z is Something Else.");// executed
}
// Be very careful with formatting
int number = 5;
if (number < 0) // condn is false. So the line in if is not executed.
number = number + 10; // Not executed
number++; // This statement is not part of if
System.out.println(number);// prints 6
// Guess the output
int k = 15;
if (k > 20) {
System.out.println(1);
} else if (k > 10) {
System.out.println(2);
} else if (k < 20) {
System.out.println(3);
} else {
System.out.println(4);
}
// Output is 2. Once a condition in nested-if-else is true the rest of
// the code is not executed.
// Guess the output
int l = 15;
if (l < 20)
System.out.println("l<20");
if (l > 20)
System.out.println("l>20");
else
System.out.println("Who am I?");
// Output is "l<20" followed by "Who am I?" on next line.
// else belong to the last if before it unless brackets ({}) are used.
// Guess the output
int m = 15;
if (m > 20)
if (m < 20)
System.out.println("m>20");
else
System.out.println("Who am I?");
// Nothing is printed to output. Above code is similar to code below
if (m > 20) {// Condn is false. So, code in if is not executed
if (m < 20)
System.out.println("m>20");
else
System.out.println("Who am I?");
}
//int x1 = 0;
// Condition in if should always be boolean
// if(x1) {} //COMPILER ERROR
// if(x1=0) {}//COMPILER ERROR. Using = instead of ==
boolean isTrue = false;
if (isTrue == true) {
System.out.println("TRUE TRUE");// Will not be printed
}
if (isTrue = true) {
System.out.println("TRUE");// Will be printed.
}
// Condition is isTrue=true. This is assignment. Returns true. So, code
// in if is executed.
}
}