[java] 数字文字を整数に変換

●数字文字を整数に変換
parseInt()

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class parseIntDemo {

     public static void main(String[] args) {
        // TODO code application logic here
        String str = "4";
        int num = Integer.parseInt(str);
        System.out.println(num);
        str = "00ff";
        num = Integer.parseInt(str, 16);
        System.out.println(num);
    }
}
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[java] 文字列の置き換え

●文字列の置き換え
replace()

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public class replaceDemo {
    public static void main(String args[]){
        String str = "123ABC";
        System.out.println(str);
        System.out.println(str.replace("ABC","DEF"));
    }
}
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[java] 文字列の結合をする

文字列の結合をする/font>

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public class concatDemo {
    public static void main(String args[]){
        String str = "ABC";
        System.out.println(str);
        System.out.println(str.concat("DEFG"));
    }
}
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