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package trial.yy.java8.client.lambda; | |
import java.util.ArrayList; | |
import java.util.Arrays; | |
import java.util.Collections; | |
import java.util.Comparator; | |
import java.util.List; | |
/** | |
* Java8 ラムダ式をComapratorに適用して試すためのサンプル | |
* User: yy | |
* Date: 13/04/17 | |
* Time: 22:00. | |
*/ | |
public class Java8CompareClient { | |
public static void main(String[] args) { | |
// 操作対象の文字列を格納したList | |
List<String> srcList = Arrays.asList("defg", "defg", "x", "xyz", "zzzzzzzz", "abc", "abcde"); | |
List<String> srcList1 = new ArrayList(srcList); | |
List<String> srcList2 = new ArrayList(srcList); | |
// 比較関数をラムダ式で記述(文字列のlength順に並べるための比較関数) | |
Comparator<String> comparator = (x, y) -> x.length() - y.length(); | |
// 比較関数を適用してソート実行 | |
Collections.sort(srcList1, comparator); | |
// ソートした結果を出力 | |
System.out.println("srcList1: " + srcList1); | |
// 比較関数をラムダ式で記述して直接sortのAPIに渡してソート実行 | |
Collections.sort(srcList2, (x, y) -> x.length() - y.length()); | |
// ソートした結果を出力 | |
System.out.println("srcList2: " + srcList2); | |
} | |
} |
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