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Java-Programs/StackUsingArray.java at master · sandhukaran28/Java-Programs · GitHub
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Java-Programs
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StackUsingArray.java
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StackUsingArray.java
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public
class
StackUsingArray
{
int
size
=
5
;
int
top
= -
1
;
int
[]
a
=
new
int
[
size
];
boolean
isEmpty
(){
return
(
top
<
0
);
}
void
push
(
int
x
){
if
(
top
>=(
size
-
1
)){
System
.
out
.
println
(
"Stack Overflow"
);
}
else
{
top
+=
1
;
a
[
top
] =
x
;
System
.
out
.
println
(
x
+
" pushed into stack"
);
}
}
int
pop
(){
if
(
top
<
0
){
System
.
out
.
println
(
"Stack Underflow"
);
return
0
;
}
else
{
int
res
=
a
[
top
];
top
--;
return
res
;
}
}
int
peek
(){
if
(
top
<
0
){
System
.
out
.
println
(
"Stack Underflow"
);
return
0
;
}
else
{
return
a
[
top
];
}
}
public
static
void
main
(
String
[]
args
) {
StackUsingArray
s
=
new
StackUsingArray
();
s
.
push
(
20
);
s
.
push
(
40
);
System
.
out
.
println
(
s
.
pop
() +
" popped out from stack"
);
s
.
push
(
30
);
System
.
out
.
println
(
"The top element is "
+
s
.
peek
());
System
.
out
.
println
(
"Is stack empty? "
+
s
.
isEmpty
());
System
.
out
.
println
(
s
.
pop
() +
" popped out from stack"
);
System
.
out
.
println
(
s
.
pop
() +
" popped out from stack"
);
System
.
out
.
println
(
"Is stack empty? "
+
s
.
isEmpty
());
}
}
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