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TwoStacks.java
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TwoStacks.java
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package com.geeksforgeeks.stack;
public class TwoStacks {
int top1;
int top2;
int size;
int[] arr;
public TwoStacks(int size) {
arr = new int[size];
top1 = -1;
top2 = size;
this.size = size;
}
public void push1(int x) {
// There is a place for atleast 1 element, so we push
if (top1 < top2 - 1) {
arr[++top1] = x;
} else {
System.out.println("Stack1 Overflow");
return;
}
}
public void push2(int x) {
if (top1 + 1 < top2) {
arr[--top2] = x;
} else {
System.out.println("Stack2 Overflow");
return;
}
}
public int pop1() {
if (top1 < 0) {
System.out.println("Stack Underflow");
return -1;
}
return arr[top1--];
}
public int pop2() {
if (top2 >= size) {
System.out.println("Stack Underflow");
return -1;
}
return arr[top2++];
}
public static void main(String[] args) {
TwoStacks twoStacks = new TwoStacks(5);
twoStacks.push1(5);
twoStacks.push2(10);
twoStacks.push2(15);
twoStacks.push1(11);
twoStacks.push2(7);
System.out.println("Popped element from" + " stack1 is " + twoStacks.pop1());
twoStacks.push2(40);
System.out.println("Popped element from" + " stack2 is " + twoStacks.pop2());
System.out.println("Popped element from" + " stack2 is " + twoStacks.pop2());
System.out.println("Popped element from" + " stack2 is " + twoStacks.pop2());
System.out.println("Popped element from" + " stack2 is " + twoStacks.pop2());
}
}