public class PeekStack {

static class Stack{

private int maxsize;

private int stackArray[];

private int top;

Stack(int size){

maxsize= size;

stackArray= new int[maxsize];

top= -1;

}

public void push(int val){

if(top== maxsize-1){

System.out.println("Stack overflow");

return;

}

stackArray[++top]= val;

}

public void display(){

for(int i=0; i<=top; i++){

System.out.print(stackArray[i] + " ");

}

}

public int peek(){

if(top==-1){

System.out.println("The stack is empty!");

return -1;

}

return(stackArray[top]);

}

}

public static void main(String[] args) {

Stack st= new Stack(5);

st.push(1);

st.push(2);

st.push(3);

st.push(4);

st.display();

System.out.println();

System.out.println("Peek element: " + st.peek());

}

}