import org.hamcrest.CoreMatchers; import org.junit.Assert; import com.google.common.base.CharMatcher;/*** TODO 在此寫上類的相關說明.<br>* @author gqltt<br>* @version 1.0.0 2021年11月11日<br>* @see * @since JDK 1.5.0*/ public class CharMatcherDemo {/*** @param args*/public static void main(String[] args) {replace();collapse();trimAndCollapse();retain();range();}/*** 替換.*/static void replace() {String stringWithLinebreaks = "This is an example\n"+"of a String with linebreaks\n"+"we want on one line";String expected = "This is an example of a String with linebreaks we want on one line";String scrubbed = CharMatcher.breakingWhitespace().replaceFrom(stringWithLinebreaks, ' ');Assert.assertThat(scrubbed, CoreMatchers.is(expected));}/*** 壓縮.*/static void collapse() {String tabsAndSpaces = "String with spaces and tabs";String expected = "String with spaces and tabs";String scrubbed = CharMatcher.whitespace().collapseFrom(tabsAndSpaces, ' ');Assert.assertThat(scrubbed, CoreMatchers.is(expected));}/*** 裁剪&壓縮.*/static void trimAndCollapse() {String tabsAndSpaces = " String with spaces and tabs";String expected = "String with spaces and tabs";String scrubbed = CharMatcher.whitespace().trimAndCollapseFrom(tabsAndSpaces,' ');Assert.assertThat(scrubbed, CoreMatchers.is(expected));}/*** 保留.*/static void retain() {String lettersAndNumbers = "foo989yxbar234";String expected = "989234";String retained = CharMatcher.javaDigit().retainFrom(lettersAndNumbers);Assert.assertThat(expected, CoreMatchers.is(retained));}/*** 字符范圍.*/static void range() {CharMatcher cm = CharMatcher.inRange('A','E');Assert.assertThat(cm.retainFrom("aaaABbbccCdddDEeee"), CoreMatchers.is("ABCDE"));} }

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