package com.cloud.oop;public class Demo2 {/*** @param args*/public static void main(String[] args) {System.out.println("===String类型：实例化String类对象===");String name="Tom";System.out.println("name="+name);String name1=new String("Cat");System.out.println("name1="+name1);System.out.println("===’==’比较字符串地址===");String str1="hello";String str2=new String("hello");String str3=str2;System.out.println(str1==str2);System.out.println(str1==str3);System.out.println(str2==str3);System.out.println("===equals比较字符串内容===");System.out.println(str1.equals(str2));System.out.println(str1.equals(str3));System.out.println(str2.equals(str3));System.out.println("===字符串的内容不可改变===");//这里是通过内存地址的断开，连接实现变化的String str4="hello";str4=str4+"China";System.out.println(str4);System.out.println("===String类的常用方法:toCharArray===");String strch="hello";char c[]=strch.toCharArray();for(int i=0;i<c.length;i++){System.out.print(c[i]+"\t");}System.out.println("");String strch1=new String(c);String strch2=new String(c, 0, 3);System.out.println(strch1+"\n"+strch2);System.out.println("===从字符串中取指定位置===");String sptr="hello";System.out.println(sptr.charAt(4));System.out.println("===和byte数组之间相互转换===");String bystr="hello";byte b[]=bystr.getBytes();System.out.println(new String(b));System.out.println(new String(b,1,3));System.out.println("===判断字符串是否存在===");String instr="dsihsadhald";System.out.println(instr.indexOf("l"));System.out.println(instr.indexOf("d", 4));System.out.println("查询不到返回："+instr.indexOf("e"));System.out.println("===去掉字符串两边的空格===");String trstr=" hell o ";System.out.println(trstr.trim());System.out.println("===去掉所有空格===");String str7=" h e l l o ";System.out.println(str7);String str8[]=str7.split(" ");for(int i=0;i<str8.length;i++){if(str8[i]==" "){return;}else{System.out.print(str8[i]);}}}}
版权声明：博主原创文章，转载请说明出处。
，你曾经说，等我们老的时候，
