j02060405.java

经典java教材《java完美经典》一书中源码的完全收集

import java.lang.*;

class j02060405
{
  public static void main(String para[])
  {
		String myStr = "阿达说：This is my String   "; //结尾有空白 
		System.out.println("开始 myStr = " + myStr + "~~");
    String testStr;
    testStr = myStr.concat("Bye");
    System.out.println("pr1 testStr = " + testStr + "~~");
    testStr = myStr.replace(' ','-'); 
		System.out.println("pr2 testStr = " + testStr + "~~");
		testStr = myStr.replaceAll("is","ese");
		System.out.println("pr3 testStr = " + testStr + "~~");
		testStr = myStr.replaceFirst("is","ese");
		System.out.println("pr4 testStr = " + testStr + "~~");
		testStr = myStr.substring(12);
		System.out.println("pr5 testStr = " + testStr + "~~");
		testStr = myStr.substring(0,4);//取索引 0~3 的字符，索引值=4 的字符不包括在内,中文字也是一个字符
		System.out.println("pr6 testStr = " + testStr + "~~");
		testStr = myStr.toLowerCase();
		System.out.println("pr7 testStr = " + testStr + "~~");
		testStr = myStr.toUpperCase();
		System.out.println("pr8 testStr = " + testStr + "~~");
		testStr = myStr.trim();
		System.out.println("pr9 testStr = " + testStr + "~~");
		String[] testArr;
		testArr = myStr.split(" ");//以一个空白为分界
		for(int x=0;x<testArr.length;x++)
		{
			System.out.println("pr10"+ x + " testArr[" + x + "] = " 
			                    + testArr[x] + "~~");
		}
		testArr = myStr.split(" ",3); //以一个空白为分界，最多分成三个
		for(int x=0;x<testArr.length;x++)
		{
			System.out.println("pr11"+ x + " testArr[" + x + "] = " 
			                    + testArr[x] + "~~");
		}
		System.out.println("结束 myStr = " + myStr + "~~");	
		      // 观察 myStr 内含的字符串值是否有改变					
  }
}