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- <dependency>
- <groupId>com.google.guava</groupId>
- <artifactId>guava</artifactId>
- <version>31.1-jre</version>
- </dependency>
- @Test
- void contextLoads() {
- //isNullOrEmpty
- System.out.println(Strings.isNullOrEmpty("")); //true
- System.out.println(Strings.isNullOrEmpty(null)); //true
- System.out.println(Strings.isNullOrEmpty("ss")); //false
-
- //nullToEmpty
- System.out.println(Strings.nullToEmpty(null)); //
-
- //emptyToNull
- System.out.println(Strings.emptyToNull("")); //null
-
- //commonPrefix:获取两个字符串相同的开头部分
- System.out.println(Strings.commonPrefix("ab","abc")); //ab
-
- //commonSuffix: 获取两个字符串相同的结尾部分
- System.out.println(Strings.commonSuffix("abc","bc")); //bc
-
- //repeat:重复某字符串若干次,并拼接在一起
- System.out.println(Strings.repeat("ab",2)); //ababa
- }
常用方法如下:
- @Test
- void contextLoads() {
- //判断是否是数字类型
- System.out.println(CharMatcher.javaDigit().matches('1')); //true
- System.out.println(CharMatcher.javaDigit().matches('c')); //false
-
- //判断是否是小写
- System.out.println(CharMatcher.javaLowerCase().matches('a')); //true
-
- //判断是否是大写
- System.out.println(CharMatcher.javaUpperCase().matches('a')); //false
-
- //移除数字
- System.out.println(CharMatcher.javaDigit().removeFrom("hello123")); //hello
-
- //移除小写字母
- System.out.println(CharMatcher.javaLowerCase().removeFrom("aabbAABB")); //AABB、、
-
- //移除空格
- System.out.println(CharMatcher.whitespace().removeFrom("hello world")); //helloworld
- }
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