public class Stack1{//一维数据模拟栈结构
    Object[] elements;//默认栈的容量为5public Stack1(){this(5);    //this 这里是代码的重用，也可以写成 elements = new Object[5];
                     }public Stack1(int max){elements = new Object[max];}//模拟栈指针int index;//压栈方法public void push(Object element) throws Stack1OperationException{if(index == elements.length){throw new Stack1OperationException("The Stack1 have been Full");}elements[index++] = element;}//弹栈方法public  Object pop() throws Stack1OperationException{if(index == 0){throw new Stack1OperationException("The Stack1 have been Empty!");}return elements[--index];}}

public class Stack1OperationException extends Exception{public void Stack1OperationException(){};public Stack1OperationException(String msg){super(msg);}}

public class TestStack1{public static void main(String[] args){Stack1 s = new Stack1();User u1 = new User("Jack",23);User u2 = new User("Ford",24);User u3 = new User("King",25);User u4 = new User("Smith",26);User u5 = new User("COOK",27);User u6 = new User("zhangsan",28);try{s.push(u1);s.push(u2);s.push(u3);s.push(u4);s.push(u5);s.push(u6);}catch(Stack1OperationException e){e.printStackTrace();}try{System.out.println(s.pop());System.out.println(s.pop());System.out.println(s.pop());System.out.println(s.pop());System.out.println(s.pop());}catch(Stack1OperationException e){e.printStackTrace();}}
}class User{String name;int age;User(String name, int age){this.name = name;this.age = age;}public String toString(){return "User[name="+name+" ,age="+age+"]";}
}