Stack Implementation using two arrays in Java || Stack Implementation

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Java Program to check whether two Strings are anagrams or not

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[mooht]

Great thank you, actually in the method pop2() when we display the element then top2 should be top2++ rather than top2-- right

[eashwarreddy]

why first if condition is not if(top1<top2-1)
it may fail for some condtions(if top1 pointing to 2 index and top2 pointing to 3 index positions of array)

[Manikandan-nnbw]

Please review and let me know :)

import java.util.Arrays;

public class TwoStacks {
int size;
int top1;
int top2;
int arr[];

public TwoStacks(int size) {
this.size = size;
this.arr = new int[size];
top1 = -1;
top2 = size;
}

public void push1(int value) {
top1++;
if (top1 == top2) {
System.out.println("Not enough memory in stack1");
top1--;
return; // should show error message
}

arr[top1] = value;
size++;
}

public void push2(int value) {
top2--;
if (top2 == top1) {
System.out.println("Not enough memory in stack2");
top2++;
return;
}

arr[top2] = value;
size++;
}

public int pop1() {
if (top1 == -1) {
System.out.println("Stack1 is empty");
return 0;
}

int value = arr[top1];
arr[top1] = 0;
top1--;
size--;

return value;
}

public int pop2() {
if (top2 == arr.length) {
System.out.println("Stack2 is empty");
return 0;
}

int value = arr[top2];
arr[top2] = 0;
top2++;
size--;

return value;
}

public void printArray() {

}
}

[sweetsisters]

Sir if the array consist of odd space consistent like 0 to 4... then we divide the array into two equal stacks right???

[onkarkulkarni]

return 0 in the functions is unreachable, isnt it? after system.exit(1), the control will not be with the function anymore.