「Java8」joinメソッドで区切文字と配列を連結するサンプル
環境
JavaSE 1.8
Eclipse 2019
書式
String String.join(区切り文字, 配列)
引数1は区切り文字を指定しします
引数2はString型の 配列を指定します
使用例
package com.arkgame.study;
public class StaticFinalDemo {
// コロン
private static final String PTN = ":";
// カンマ
private static final String PTN2 = ",";
public static void main(String[] args) {
String cityArr[] = new String[] {"Tokyo", "oosak", "fukuoka"};
String res = String.join(PTN, cityArr);
System.out.println("結果1: " + res);
String cityArr2[] = new String[] {"東京", "大阪", "福岡"};
String res2 = String.join(PTN2, cityArr2);
System.out.println("結果2: " + res2);
}
}
package com.arkgame.study;
public class StaticFinalDemo {
// コロン
private static final String PTN = ":";
// カンマ
private static final String PTN2 = ",";
public static void main(String[] args) {
String cityArr[] = new String[] {"Tokyo", "oosak", "fukuoka"};
String res = String.join(PTN, cityArr);
System.out.println("結果1: " + res);
String cityArr2[] = new String[] {"東京", "大阪", "福岡"};
String res2 = String.join(PTN2, cityArr2);
System.out.println("結果2: " + res2);
}
}
package com.arkgame.study;
public class StaticFinalDemo {
// コロン
private static final String PTN = ":";
// カンマ
private static final String PTN2 = ",";
public static void main(String[] args) {
String cityArr[] = new String[] {"Tokyo", "oosak", "fukuoka"};
String res = String.join(PTN, cityArr);
System.out.println("結果1: " + res);
String cityArr2[] = new String[] {"東京", "大阪", "福岡"};
String res2 = String.join(PTN2, cityArr2);
System.out.println("結果2: " + res2);
}
}
実行結果
結果1: Tokyo:oosak:fukuoka
結果2: 東京,大阪,福岡