单选题 下列代码的输出结果是_________ ?public class Test { public static void main(String[] args) { new Test(); } public Test() { PrintChar printA = new PrintChar('a', 4); PrintChar printB = new PrintChar('b', 4); printA.run(); printB.run(); } class PrintChar implements Runnable { private char charToPrint; // The character to print private int times; // The times to repeat public PrintChar(char c, int t) { charToPrint = c; times = t; } public void run() { for (int i = 0; i < times; i++) System.out.print(charToPrint); } }}