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Java-Programs/loopAndFlow/IfElseExamples.java at master · vijaykumarcm/Java-Programs · GitHub
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IfElseExamples.java
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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.
}
}
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