World!";// 调用获取后四位的方法StringlastFour=getLastFourCharacters(input);System.out.println("输入字符串的后四位: "+lastFour);}publicstaticStringgetLastFourCharacters(Stringstr){// 检查字符串长度if(str.length()<4){returnstr;// 如果长度小于4,返回全部}returnstr.substring(str.length()-4);/...
最后,我们可以通过substring方法来截取最后四位字符串。 StringlastFourCharacters=originalString.substring(length-4); 1. 三、完整代码示例 publicclassMain{publicstaticvoidmain(String[]args){StringoriginalString="HelloWorld";intlength=originalString.length();StringlastFourCharacters=originalString.substring(length-4)...
1. Using Plain Java We may need to get the last 4 characters when we are dealing with customer-sensitive data such as phone numbers or SSNs. In this case, we need to display only the last 4 characters to mask the sensitive data. To get a substring having the last 4 chars first chec...
The simplest solution for masking a string except the last N digits is using theregexwithString.replaceAll()function. ThereplaceAll()function replaces each matching substring with the given replacement string. In the following code, regex matches each character in the string except the last 4 char...
bdsajjds bd 3.通过StringUtils提供的方法StringUtils.substringBefore(“dskeabcee”, “e”); /结果是:dsk/ 这里是以第一个”e”,为标准。 StringUtils.substringBeforeLast(“dskeabcee”, “e”) 结果为:dskeabce 这里以最后一个“e”为准。
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**/publicclassUsingSubStringFunction {//Function to reverse a string in Java using recursionprivatestaticString reverse(String str) {//base case: if string is null or emptyif(str ==null|| str.equals(""))returnstr;//last character + recurse for remaining stringreturnstr.charAt(str.length()...
三个方法的使用: lenth() substring() charAt() package com.mpp.string; public class StringDemo1 { public static void main(String[] args) { //定义一个字符串"晚来天欲雪 能饮一杯无" 代码语言:txt AI代码解释 String str = "晚来天欲雪 能饮一杯无"; 代码语言...
2.StringBuilder的subString()方法toString()方法 StringBuilder中其实没有subString方法,subString的实现是在StringBuilder的父类AbstractStringBuilder中的。它的代码非常简单,源码如下: public String substring(int start, int end) { if (start < 0) throw new StringIndexOutOfBoundsException(start); ...
3. Longest Substring Without Repeating Characters Given a string, find the length of the longest substring without repeating characters. Examples: Given"abcabcbb", the answer is"abc", which the length is 3. Given"bbbbb", the answer is"b", with the length of 1. ...