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  1.     public partial class Form1 : Form
  2.     {
  3.         public Form1()
  4.         {
  5.             InitializeComponent();
  6.         }
  7.  
  8.         private void Form1_Shown(object sender, EventArgs e)
  9.         {
  10.             int count = 80;
  11.  
  12.             DataGridViewColumn[] cols = new DataGridViewColumn[count];
  13.  
  14.             for (int i = 0; i < count; ++i)
  15.             {
  16.                 cols[i] = new DataGridViewTextBoxColumn();
  17.             }
  18.  
  19.             dataGridView1.Columns.AddRange(cols);
  20.         }
  21.  
  22.         private void button1_Click(object sender, EventArgs e)
  23.         {
  24.             memoryLeakTest();
  25.         }
  26.  
  27.         private void memoryLeakTest()
  28.         {
  29.             //してもしなくても変わらなかったのでコメント化
  30.             //foreach (DataGridViewRow row in dataGridView1.Rows)
  31.             //{
  32.             //    row.Dispose();
  33.             //}
  34.  
  35.             dataGridView1.Rows.Clear();
  36.  
  37.             int dataCount = 300;
  38.  
  39.             int colCount = dataGridView1.Columns.Count;
  40.  
  41.             DataGridViewRow[] rows = new DataGridViewRow[dataCount];
  42.  
  43.             for (int i = 0; i < dataCount; ++i)
  44.             {
  45.                 DataGridViewRow row = new DataGridViewRow();
  46.                 row.CreateCells(dataGridView1);
  47.  
  48.                 for (int j = 0; j < colCount; ++j)
  49.                 {
  50.                     row.Cells[j].Value = $"{i}の{j}";
  51.                 }
  52.  
  53.                 rows[i] = row;
  54.             }
  55.  
  56.             dataGridView1.Rows.AddRange(rows);
  57.         }
  58.     }
  59.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
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:50: error: ';' expected
                    row.Cells[j].Value = $"{i}?{j}";
                                          ^
3 errors
stdout
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Standard output is empty
https://ideone.com/VK5exD
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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