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public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            string hyouji;
            TextBox textbox01 = new TextBox();
            this.Controls.Add(textbox01);
            hyouji = Test01();
            textbox01.Text = hyouji;
        }
 
        private string Test01()//テスト用オブジェ作成メソッド
        {
            List<string> testList = new List<string> { "a", "b" ,"あ","ん"};
            Testclass jikken;
            jikken = new Testclass();
            jikken.youso = testList;
            return jikken.test();
        }
    }
 
    public class Testclass//クラスと配列のテスト用
    {
        public List<string> youso = new List<string>();
        string modori;
        public string test()
        {
            modori = string.Join(",", youso);
            modori = modori + "-" + modori;
            return modori; 
        }
 
    }
 

Main.java:1: error: class, interface, or enum expected
public partial class Form1 : Form
       ^
Main.java:1: error: '{' expected
public partial class Form1 : Form
                          ^
Main.java:19: error: '(' or '[' expected
            List<string> testList = new List<string> { "a", "b" ,"?","?"};
                                                     ^
Main.java:19: error: not a statement
            List<string> testList = new List<string> { "a", "b" ,"?","?"};
                                                       ^
Main.java:19: error: ';' expected
            List<string> testList = new List<string> { "a", "b" ,"?","?"};
                                                          ^
Main.java:21: error: <identifier> expected
            jikken = new Testclass();
                  ^
Main.java:22: error: <identifier> expected
            jikken.youso = testList;
                        ^
Main.java:23: error: illegal start of type
            return jikken.test();
            ^
Main.java:23: error: ';' expected
            return jikken.test();
                  ^
Main.java:23: error: illegal start of type
            return jikken.test();
                         ^
Main.java:25: error: class, interface, or enum expected
    }
    ^
11 errors

Standard output is empty