爲何打印「B」比打印「＃」要慢得多？ - Why is printing 「B」 dramatically slower than printing 「#」?

問題：

I generated two matrices of 1000 x 1000 : 我生成了兩個1000 x 1000矩陣：

First Matrix: O and # . 第一個矩陣： O和# 。
Second Matrix: O and B . 第二個矩陣： O和B

Using the following code, the first matrix took 8.52 seconds to complete: 使用如下代碼，第一個矩陣須要8.52秒才能完成：

Random r = new Random();
for (int i = 0; i < 1000; i++) {
    for (int j = 0; j < 1000; j++) {
        if(r.nextInt(4) == 0) {
            System.out.print("O");
        } else {
            System.out.print("#");
        }
    }

   System.out.println("");
 }

With this code, the second matrix took 259.152 seconds to complete: 使用此代碼，第二個矩陣須要259.152秒才能完成：

Random r = new Random();
for (int i = 0; i < 1000; i++) {
    for (int j = 0; j < 1000; j++) {
        if(r.nextInt(4) == 0) {
            System.out.print("O");
        } else {
            System.out.print("B"); //only line changed
        }
    }

    System.out.println("");
}

What is the reason behind the dramatically different run times? 運行時間大不相同的緣由是什麼？

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As suggested in the comments, printing only System.out.print("#"); 正如評論中所建議的那樣，只打印System.out.print("#"); takes 7.8871 seconds, whereas System.out.print("B"); 須要7.8871秒，而System.out.print("B"); gives still printing... . still printing...

As others who pointed out that it works for them normally, I tried Ideone.com for instance, and both pieces of code execute at the same speed. 正如其餘人指出它一般適用於他們同樣，我嘗試過Ideone.com ，兩段代碼都以相同的速度執行。

Test Conditions: 測試條件：

• I ran this test from Netbeans 7.2 , with the output into its console 我從Netbeans 7.2運行了這個測試，輸出到它的控制檯
• I used System.nanoTime() for measurements 我使用System.nanoTime()進行測量

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解決方案：

參考一： https://stackoom.com/question/1U5XA/爲何打印-B-比打印-要慢得多
參考二： https://oldbug.net/q/1U5XA/Why-is-printing-B-dramatically-slower-than-printing