下面是一个使用循环和字符串拼接生成指定长度字符串的示例代码: publicclassStringGenerator{publicstaticStringgenerateString(intlength){Stringcharacters="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";StringBuildersb=newStringBuilder(length);for(inti=0;i<length;i++){intindex=(int)(Math.random()...
第一种生成机制generateByShuffle()基于Collections.shuffle 生成六位随机字符串。generateByRandom(int length)借助Random()函数生成区分字母大小写的随机字符串,字符串长度可以根据入参自定义,提供了更灵活的生成机制。doGenerate(int count, String[] source) 是generateByRandom(int length)的简化版。第四种生成机制g...
publicstaticString generateUpperString(intlength) { returngenerateMixString(length).toUpperCase(); } /** * 生成一个定长的纯0字符串 * * @param length 字符串长度 * @return 纯0字符串 */ publicstaticString generateZeroString(intlength) { StringBuffer sb =newStringBuffer(); for(inti =0; i <...
Now let’s use Random.ints, added in JDK 8, to generate an alphabetic String: @Test public void givenUsingJava8_whenGeneratingRandomAlphabeticString_thenCorrect() { int leftLimit = 97; // letter 'a' int rightLimit = 122; // letter 'z' int targetStringLength = 10; Random random = n...
public static String concatIndy(int i) { return new StringBuilder("value ") .append(i) .toString(); } 可以看出,在JDK 8中,在非循环体内使用"+"实现字符串拼接和使用StringBuilder是一样的,用"+"做拼接代码更简洁,推荐使用"+"而不是StringBuilder。
示例: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 publicclassRandomStringDemo{publicstaticvoidmain(String[]args){// Creates a 64 chars length random string of number.String result=RandomStringUtils.random(64,false,
}}// Alternative ConstructorpublicEmployee(int id,String firstName){this(id,firstName,null);}// Instance methodspublicvoidgetFullName(){if(lastName==null)System.out.println(firstName());elseSystem.out.println(firstName()+" "+lastName());}// Static methodspublicstaticintgenerateEmployeeToken(...
*@paramlength 验证码长度,要求大于0的整数 *@paramexcludeString 需排除的特殊字符(无需排除则为null) *@return验证码字符串*/publicstaticString generateTextCode(inttype,intlength, String excludeString){if(length <= 0){return""; } StringBuffer verifyCode=newStringBuffer();inti = 0; ...
Assert.hasLength(String text,"text must be specified")-字符不为null且字符长度不为0Assert.hasText(String text,"text must not be empty")-text 不为null且必须至少包含一个非空格的字符 Assert.isInstanceOf(Class clazz,Object obj,"clazz must be of type [clazz]")-obj必须能被正确造型成为clazz 指定...
Stringstr="Hello, World!";System.out.println(str.length());// 输出:13System.out.println(str.charAt(0));// 输出:HSystem.out.println(str.concat(" Welcome!"));// 输出:Hello, World! Welcome!System.out.println(str.equals("Hello, World!"));// 输出:trueSystem.out.println(str.indexOf(...