出于谋生的原因，最近还是静下心来学习Java programming了，贴一些最近自己动手coding过的代码以及经验吧.Java大牛们狠狠的拍吧.(代码都是来自Core Java 2 Volume I，有所改动)--------------------------------------------------------------------------------------------------------------------public class ArrayTest{public static void main(String args[]){int[] smallPrimes = {2,3,5,7,9,11,13};for(int i = 0;i < smallPrimes.length;i++)System.out.println(i+": "+smallPrimes[i]);smallPrimes = new int[]{1,1,1,1,1,1,1};System.out.println("After reinitialize...");for(int i = 0;i < smallPrimes.length;i++)System.out.println(i+": "+smallPrimes[i]);}}/*1.Array的获取大小的方法是length而不是length();2.可以用 A = new int[]{x,x,x,x,x,x}的方式重新初始化一个Array；*/--------------------------------------------------------------------------------------------------------------------public class ArrayCopyTest{public static void main(String args[]){int[] OldArray = {1,2,3,4,5,6};int[] NewArray = {7,8,9,10,11,12};System.out.println("Before Copying...");System.out.println("OldArray is ...");for(int i = 0;i < OldArray.length;i++)System.out.println(i+": "+OldArray[i]);System.out.println("NewArray is ...");for(int i = 0;i < NewArray.length;i++)System.out.println(i+": "+NewArray[i]);System.arraycopy(NewArray,0,OldArray,0,6);System.out.println("After copying...");System.out.println("OldArray is ...");for(int i = 0;i < OldArray.length;i++)System.out.println(i+": "+OldArray[i]);System.out.println("NewArray is ...");for(int i = 0;i < NewArray.length;i++)System.out.println(i+": "+NewArray[i]);}}/*1.System.arraycopy可以在两个Array之间进行Array元素的值的copy；2.Array元素的index从0开始，在遍历Array时应该是使用< sets.length;i++)sets[i] = i + 1;for(int i = 0;i < k;i++){int r = (int)(Math.random() * n);result[i] = sets[r];sets[r] = sets[n-1];n--;}Arrays.sort(result);for(int r:result)System.out.println("I_th in result is "+r);}}/*1.Math.random()与某个int型相乘后可能损失精度，需要用(int)(Math.random()*n)强制转换,Math类属于java.lang.2.foreach形式的loop里面那个是':'而不是';';3.Arrays类属于java.util,里面有些可用于Array(搜索和排序)的方法.*/--------------------------------------------------------------------------------------------------------------------import java.util.*;public class OutStreamTest{public static void main(String args[]){Scanner in = new Scanner(System.in);System.out.println("What's your name?");String name = in.nextLine();System.out.println("OK,your name is "+name);}}/*总结：1.Scanner必须引用自java.util;2.System.in...3.import一行后面必须有';'*/PS:MSN的空间实在是太慢了，又想搬家了...