如何在文本框中显示循环语句？

Question

try {
    num = Integer.parseInt(userText.getText());
    for (i = 1; i <= num; i++) {
        if (num % i == 0)
            textFieldAns.setText(" "+i);
    }
} catch (Exception e) {
    JOptionPane.showMessageDialog(null, "Please Enter Valid number");
 }

输出似乎没有以循环语句的形式显示数字的因数。

Answer 1

您应该将全文构建在 StringBuilder:

int num = Integer.parseInt(userText.getText());
StringBuilder buf = new StringBuilder();
for (i = 1; i <= num; i++) {
    if (num % i == 0)
        buf.append(" ").append(i);
}
textFieldAns.setText(buf.substring(1));