新・Java入門編19:ペアの有無を確認(containsKey)

import java.util.LinkedHashMap;

public class Main {
    public static void main(String... args) {
        LinkedHashMap<String, Integer> scoreMap = new LinkedHashMap<>();

        scoreMap.put("国語", 100);
        scoreMap.put("英語", 90);
        scoreMap.put("数学", 80);
    }
}

import java.util.LinkedHashMap;

public class Main {
    public static void main(String... args) {
        LinkedHashMap<String, Integer> scoreMap = new LinkedHashMap<>();

        scoreMap.put("国語", 100);
        scoreMap.put("英語", 90);
        scoreMap.put("数学", 80);
    }
}

import java.util.LinkedHashMap;

public class Main {
    public static void main(String... args) {
        LinkedHashMap<Integer, String> users = new LinkedHashMap<>();

        users.put(1, "kirishima");
        users.put(2, "rokumura");
        users.put(3, "midorikawa");
        
        
    }
}

import java.util.LinkedHashMap;

public class Main {
    public static void main(String... args) {
        LinkedHashMap<Integer, String> users = new LinkedHashMap<>();

        users.put(1, "kirishima");
        users.put(2, "rokumura");
        users.put(3, "midorikawa");
        
        
    }
}

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