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1 调试程序，改正错误，使程序正常运行。 class M{ int a; public int b; private int c;

1 调试程序，改正错误，使程序正常运行。 class M{ int a; public int b; private int c; private void print(){ System.out.println(c); } } public class Test { public static void main(String args[]){ M m = new M(); m.a = 9; m.b=20; m.c = 99;

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1 调试程序，改正错误，使程序正常运行。 class M{ int a; public int b; private int c;

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  1. 1 调试程序，改正错误，使程序正常运行。 class M{ int a; public int b; private int c; private void print(){ System.out.println(c); } } public class Test { public static void main(String args[]){ M m = new M(); m.a = 9; m.b=20; m.c = 99; System.out.println( m.a + m.b + m.c ); m.print(); }

  2. 1 建立一个日期类，表达年月日。 1）设置一个日期的方法，注意，年不能为负数，月要在1-12之间，日要在 1-31之间，否则不要赋值。如能考虑闰年、大月、小月更好。 2）返回年、月、日的方法, 3）可以计算是否是闰年，返回 True /false 4）打印如 2010-11-20 的日期 *5) 比较两个日期是否相等，相等返回 true. • 2 写出一个表示复数的类。 复数由实部及虚部组成，显示为（a , bi),a为实部，b为虚部。 要求：1）能为复数赋值 2）能打印如 (3+7i) 的复数 3）实现虚数的加运算。 4）实现虚数的减运算。 测试：计算(2,5i)及（3，7i）的和及差,并打印和、差。

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