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- import java.io.BufferedReader;
- import java.io.InputStreamReader;
- public class Main {
- public static void main(String[] args) throws Exception {
- Main main = new Main();
- main.exec();
- main.exec2();
- }
- // イミュータブル
- void exec() {
- String str = "string!!";
- this.strToNull(str);
- System.out.println(str);
- }
- void strToNull(String arg) {
- arg = arg + "test";
- }
- // ミュータブル
- void exec2() {
- StringBuilder str = new StringBuilder("string!!");
- this.strToNull2(str);
- System.out.println(str.toString());
- }
- void strToNull2(StringBuilder arg) {
- arg.append("test");
- }
- }
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