「Java」StringBuilder.append()で文字列を追加する

2021年11月3日

書式
StringBuilder 変数名 = new StringBuilder(文字列);
変数名.append(追加文字列");

使用例

package com.arkgame.study;

public class AppendDemo {

      public static void main(String[] args) {
            StringBuilder cft = new StringBuilder("tokyo");
            cft.append("2020");
            System.out.println(cft.toString());

            StringBuffer sr = new StringBuffer(" hello world ");
            cft.append(sr);
            System.out.println(cft.toString());

            boolean bn = false;
            cft.append(bn);
            System.out.println(cft.toString());

            double dd = 23456.01;
            cft.append(dd);
            System.out.println(cft.toString());

            char ch = '2';
            cft.append(ch);
            System.out.println(cft.toString());

            char[] cA = { 'b', 'c' };
            cft.append(cA);
            System.out.println(cft.toString());

      }

}

 

結果

tokyo2020
tokyo2020 hello world
tokyo2020 hello world false
tokyo2020 hello world false23456.01
tokyo2020 hello world false23456.012
tokyo2020 hello world false23456.012bc

 

Java

Posted by arkgame