Java 基础一些代码练习笔记（ GenericFoo<T> 泛型2）

package com.lee2;public class SimpleCollection<T>{private T[] objArr;private int index = 0;public SimpleCollection(){objArr = (T[]) new Object[10];}public SimpleCollection(int capacity){objArr = (T[])new Object[capacity];}public void add(T t){objArr[index++] = t;}public int getLength(){return this.index;}public T get(int i)     //把值取出来{return objArr[i];}public static void main(String[] args){SimpleCollection<Integer> c = new SimpleCollection<Integer>();for(int i = 0; i < 10; i++){c.add(new Integer(i));}for(int i = 0; i < 10; i++){Integer in = c.get(i);System.out.println(in);}}}

package com.lee2;public class WrapperFoo<T>{private GenericFoo3<T> foo;public GenericFoo3<T> getfoo(){return foo;}public void setFoo(GenericFoo3<T> foo){this.foo = foo;}public static void main(String[] args){GenericFoo3<Integer> foo = new GenericFoo3<Integer>();foo.setFoo(new Integer(-10));WrapperFoo<Integer> wrapper = new WrapperFoo<Integer>();wrapper.setFoo(foo);GenericFoo3<Integer> g = wrapper.getfoo();System.out.println(g.getFoo());}}class GenericFoo3<T>{private T foo;public T getFoo(){return foo;}public void setFoo(T foo){this.foo = foo;}}

package com.lee2;import java.util.ArrayList;import java.util.Iterator;import java.util.List;public class ArrayListTest{public static void main(String[] args){List<String> list = new ArrayList<String>();list.add("a");list.add("b");list.add("c");list.add("d");for(int i = 0; i < list.size(); i++){String value = list.get(i);System.out.println(value);}for(Iterator<String> iter = list.iterator(); iter.hasNext();){String value = iter.next();System.out.println(value);}}}