源代码Stack.java
| 以下是引用片段： package org; public class Stack ...{ public static class Link ...{ protected Object data; protected Link next; public Link(Object data, Link next) ...{ this.data = data; this.next = next; } } private Link head = null; public void push(Object data) ...{ head = new Link(data, head); } public Object peek() ...{ return head.data; } public Object pop() ...{ if (head == null) return null; Object o = head.data; head = head.next; return o; } } 测试代码StackTest.java package org; import junit.framework.TestCase; public class StackTest extends TestCase ...{ public void test1() ...{ Stack s = new Stack(); assertEquals(null, s.pop()); s.push("a"); s.push("b"); assertEquals("b", s.peek()); assertEquals("b", s.pop()); assertEquals("a", s.pop()); assertEquals(null, s.pop()); } public void test2() ...{ Stack s = new Stack(); assertEquals(null, s.pop()); s.push(new Integer(1)); s.push(new Integer(2)); assertEquals(2, ((Integer)s.peek()).intValue()); assertEquals(2, ((Integer)s.pop()).intValue()); assertEquals(1, ((Integer)s.pop()).intValue()); assertEquals(null, s.pop()); } } |
责任编辑：虫虫
