Guava部分字符串处理工具类的例子 博客分类: java guava字符串工具类
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2024-03-18 09:24:22
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1.CaseFormat
import com.google.common.base.CaseFormat; import static com.le.test.Printer.*; /** * * @author zhongchenghui */ public class CaseFormatTest { public static void main(String[] args) { println(CaseFormat.LOWER_CAMEL.to(CaseFormat.UPPER_UNDERSCORE, "areaCode"));// returns "constantName" println(CaseFormat.LOWER_HYPHEN.to(CaseFormat.LOWER_UNDERSCORE, "area-code"));// returns "constantName" println(CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, "area_code"));// returns "constantName" println(CaseFormat.UPPER_CAMEL.to(CaseFormat.UPPER_CAMEL, "AreaCode"));// returns "constantName" println(CaseFormat.UPPER_UNDERSCORE.to(CaseFormat.UPPER_UNDERSCORE, "AREA_CODE"));// returns "constantName" } } public class Printer { public static void println(Object object) { System.out.println(object); } }
2.CharMatcher
import com.google.common.base.CharMatcher; import static com.le.test.Printer.*; /** * * @author zhongchenghui */ public class CharMatcherTest { public static void main(String[] args) { String string = " sf4s dfI54YOd IUYIU 234jlklsf23 "; //移除control字符 println(CharMatcher.JAVA_LOWER_CASE.removeFrom(string)); //只保留数字字符 println(CharMatcher.DIGIT.retainFrom(string)); //去除两端的空格,并把中间的连续空格替换成单个空格 println(CharMatcher.WHITESPACE.trimAndCollapseFrom(string, ' ')); //用*号替换所有数字 println(CharMatcher.JAVA_DIGIT.replaceFrom(string, "*")); // 只保留数字和小写字母 println(CharMatcher.JAVA_DIGIT.or(CharMatcher.JAVA_LOWER_CASE).retainFrom(string)); } }
3.Joiner
import com.google.common.base.Joiner; import static com.le.test.Printer.*; import java.util.Arrays; /** * * @author zhongchenghui */ public class JoinerTest { public static void main(String[] args) { println(Joiner.on(";").skipNulls().join("Harry", null, "Ron", "Hermione")); println(Joiner.on(";").useForNull("Tic").join("Harry", null, "Ron", "Hermione")); println(Joiner.on(",").join(Arrays.asList(1, 5, 7))); // returns "1,5,7" } }
4.Splitter
import com.google.common.base.Splitter; import com.google.common.collect.Lists; import static com.le.test.Printer.*; /** * * @author zhongchenghui */ public class SplitterTest { public static void main(String[] args) { println(Lists.newArrayList(Splitter.on("##").trimResults().omitEmptyStrings().split("a##b##"))); println(Lists.newArrayList(Splitter.on("##").trimResults().omitEmptyStrings().split(" a ##b ## "))); println(Lists.newArrayList(Splitter.on("##").trimResults().omitEmptyStrings().split(" a ###b #c# d##"))); println(Lists.newArrayList(Splitter.on("##").trimResults().omitEmptyStrings().split(""))); } }