Creating Stack, HELP, urgent

Question

- need to create a stack from an array, which is at a fixed size of 50, and the stack class cannot be used, or vectors
public StackClass(int size)
public boolean push(String input)
- returns true if pushed, and should push a string onto stack
public String pop()
- returns String top of stack, deletes if from stack
public boolean empty()
-says if there is anything in the stack
public String ontop()
- returns string on top of the stack
- i have tried to write these methods numerous times, and am having serius difficulties since i am new to java,
thanks for the help

Answer 1

class StackClass{
private String arr[];
private int top;
pirvate int s;
StackClass(int size){
arr=new String[size];
s=size;
public boolean push(String input){
if(top==s)
return false
arr[top++]=input;
return true;
public String pop(){
if(top!=0)
return arr[--top];
return null;
public boolean empty(){
if(top!=s)
return true;
return false;
public String onTop(){
return arr[top-1];
}