Object和集合.pptVIP

工具类及常用算法Part 1Java语言基础类（java.lang包） ;Object 类(1);Object 类(2);;Object 类: equals();Object 类: equals();Object 类: equals() ;class MyNewDate extends MyDate{ public MyNewDate(int i,int j,int k){ super(i,j,k); } //重写 equals() 方法 public boolean equals (Object obj){ if (obj instanceof MyNewDate){ MyNewDate m = (MyNewDate) obj; if (m.day == day m.month == month m.year == year){ return true; } else return false; }else return false; }} public class TestDate{ public static void main(String args[]){ MyDate m1 = new MyDate(24,3,2006); MyDate m2 = new MyDate(24,3,2006); System.out.println(m1.equals(m2)); // ? m1 = new MyNewDate(24,3,2006); m2 = new MyNewDate(24,3,2006); System.out.println(m1.equals(m2)); // ? } };hashcode（）;Object 类: toString();Object 类: getClass() ;JAVA反射机制（1）;JAVA反射机制（2）;JAVA反射机制（3）;JAVA反射机制（4）;;工具类及常用算法Part 2集合类;数组 vs Collection;Arrays类（java.util.Arrays）;Java集合类介绍;数据结构-向量Vector;向量Vector;数据结构-堆栈Stack;import java.util.*; public class TestStack{ static String[] months = { Jan,Feb,Mar}; public static void main(String args[]){ Stack s = new Stack(); for(int i = 0; imonths.length; i++){ s.push(months[i]+); } System.out.println(Stack = +s); while (!s.empty()){ System.out.println(s.pop()); } } } ;Hashtable类;import java.util.*; public class TestHashTable{ public static void main(String args[]){ Hashtable ht = new Hashtable(); ht.put(one,new Integer(1)); ht.put(two,new Integer(2)); ht.put(three,new Integer(3)); Enumeration em = ht.keys(); while (em.hasMoreElements()){ Object key = em.nextElement(); Object value = ht.get(key); System.out.println( +key+ = +value); }}};新集合类Java Collections Framework;Java集合类;;List接口;ArrayList举例;LinkedList及队列;import java.util.*; public class TestHashTable{ public static void main(String args[]){ Queue q = new Queue(); for(int i = 0; i5; i++) q.enqueue( +i); while (!q.isEmpty()){ System.out.println(q.dequeue()); }} } class Queue extends LinkedL