Java Guava CharMatcher类

1 什么是Guava CharMatcher类

CharMatcher 提供了各种方法来处理各种 JAVA 类型的 char 值。

2 Guava CharMatcher类的语法

@GwtCompatible(emulated = true)
public final class CharMatcher
   extends Object

3 Guava CharMatcher类的方法

5 Guava CharMatcher类的例子

让我们看一个简单的Guava CharMatcher类示例。

package com.yiidian;

import com.google.common.base.CharMatcher;

public class GuavaTester {
   public static void main(String args[]) {
      GuavaTester tester = new GuavaTester();
      tester.testCharMatcher();
   }

   private void testCharMatcher() {
      System.out.println(CharMatcher.DIGIT.retainFrom("mahesh123"));    // only the digits
      System.out.println(CharMatcher.WHITESPACE.trimAndCollapseFrom("     Mahesh     Parashar ", ' '));

      // trim whitespace at ends, and replace/collapse whitespace into single spaces
      System.out.println(CharMatcher.JAVA_DIGIT.replaceFrom("mahesh123", "*"));  // star out all digits
      System.out.println(CharMatcher.JAVA_DIGIT.or(CharMatcher.JAVA_LOWER_CASE).retainFrom("mahesh123"));

      // eliminate all characters that aren't digits or lowercase
   }
}

输出结果为：