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  • Java中替换字符串中特定字符,replaceAll,replace,replaceFirst的区别

    使用“;”替换过字符串中的“,”

    public class Test01 {
    public static void main(String[] args) {
    String number = "123,456,5234,52345,63456,7456,7";
    String newNumber = number.replace(",", ";");
    System.out.println(newNumber);
    }

    }

    结果:

    123;456;5234;52345;63456;7456;7

    replaceAll,replace,replaceFirst的区别

    String strTmp = new String("BBBBBBBYYYYYYY");


    replaceAll支持正则表达式和字符替换
    strTmp = strTmp.replaceAll ("\D", "Y");
    System.out.println(strTmp);
    strTmp = strTmp.replaceAll ("Y", "N");
    System.out.println(strTmp);


    replace支持字符和字符串替换
    strTmp = strTmp.replace("N", "C");
    System.out.println(strTmp);


    只替换第一个字符
    strTmp = strTmp.replaceFirst("\D", "q");
    System.out.println(strTmp);

    public class Main {
    
        public static void main(String[] args) {
    	    String strTmp = new String("BBBBYYYYYY");
    
    	    strTmp = strTmp.replaceAll("\D","Y");
    	    System.out.println(strTmp);
            strTmp = strTmp.replaceAll("Y","N");
            System.out.println(strTmp);
    
            strTmp = strTmp.replace("N","C");
            System.out.println(strTmp);
    
            strTmp = strTmp.replaceFirst("\D","q");
            System.out.println(strTmp);
        }
    }
    

     结果:

    YYYYYYYYYY
    NNNNNNNNNN
    CCCCCCCCCC
    qCCCCCCCCC

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  • 原文地址:https://www.cnblogs.com/csushl/p/11946455.html
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