java常用字符串处理

编程技术  /  houtizong 发布于 3年前   74

/*@src  http://eric-619.iteye.com/blog/693636* java.lang.String类中常见的方法：（字符串处理常用的方法）* 1.参数不严格 ;    2,字符串支持正则表达式* * 1、length():*     制定一个字符串的长度；*    * 2、substring(int begin)*    substring(int beginindex, int endindex)*     substring()，参数从零开始数字符串；*     * 3、split(String s1)*    split(String s2, int i)* * 4、startsWith(String s1)*    startsWith(String s2, int i)*    endsWith(String s3)* * 5、replace(String sb, String st)*    replaceAll(String sb, String st)* */public class TestString {    public static void main(String[] args){   new TestString().testLength();   new TestString().testSubstring();   new TestString().testSplit();   new TestString().testStartsendsWith();   new TestString().testReplaceAll();}            // 1、length():    public void testLength(){    String slen = "abc";    String slenn = new String("abcdefg");    int i = slen.length();    int k = slenn.length();    System.out.println(i);    System.out.println(k);    System.out.println("-----------------------------");    }            // 2、substring(int begin)、substring(int beginindex, int endindex)    // 注意：字符串从零开始数    public void testSubstring(){    String se = new String("abcdefgh");    String sea = se.substring(3);    String seaa = se.substring(3,5);    System.out.println(sea);    System.out.println(seaa);    System.out.println("--------------------------------");    }            // 3、split(String s1)、split(String s2, int i)    public void testSplit(){         String s = "阳光:沙滩:海浪:仙人掌";         String[] results = s.split(":");         String[] result = s.split(":",3);         for(String each:results){            System.out.println(each);         }         System.out.println("------");         for(String each:result){          System.out.println(each);         }         System.out.println("-----------------------------------");     }            // 4、startsWith(String s1)、startsWith(String s2, int i)、endsWith(String s3)    public void testStartsendsWith(){    String str2 = new String("zyxwvuabcdef");    boolean bstart = str2.startsWith("z");    boolean bend = str2.endsWith("f");    if(bstart){       System.out.println("true");    }else{       System.out.println("false");    }    if(bend){       System.out.println("true");    }else{       System.out.println("false");    }    System.out.println("---------------------------------------");    }            // 5、replace(String sb, String st)、replaceAll(String sb, String st)    public void testReplaceAll(){    String sre = new String("cbadzyc");    String rsre = sre.replace("c","a");    String rasre = sre.replaceAll("c","b");    System.out.println(rsre);    System.out.println(rasre);    System.out.println("-----------------------------------------");    }}