Guava学习笔记：List<E>转换(int->String)
package com.amg.test;import java.util.List;import com.google.common.base.Function;import com.google.common.base.Preconditions;import com.google.common.collect.Lists;public class Integer2String {public static void main(String[] args) {Function function = new Function<Integer, String>() {@Overridepublic String apply(Integer input) {Preconditions.checkArgument(null != input && !"".equals(input), "input is null!");return String.valueOf(input);}};List<Integer> fromList = Lists.newArrayList(111, 33, 222, 675432);List<String> to = Lists.transform(fromList, function);for (int i = 0; i < fromList.size(); i++) {System.out.println(to.get(i));}}}

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method2：

package com.amg.test;import java.util.List;import com.google.common.base.Function;import com.google.common.base.Preconditions;import com.google.common.collect.Lists;public class Integer2String {public static void main(String[] args) {List<Integer> fromList = getIntList();List<String> to = transferInt2String(fromList);for (String str : to) {System.out.println(str);}}public static List<Integer> getIntList() {return Lists.newArrayList(111, 33, 222, 675432);}public static List<String> transferInt2String(List<Integer> fromList) {return Lists.transform(fromList, new Function<Integer, String>() {@Overridepublic String apply(Integer input) {Preconditions.checkArgument(null != input && !"".equals(input),"input is null!");return String.valueOf(input);}});}}

?运行结果：

11133222675432

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