package 上机练习; public class A02class { String names[] = new String[30]; public void showA(String name) { for (int i = 0; i < names.length; i++) { if (names[i] == null) { names[i] = name; break; } } } public void showB() { System.out.println("\t客户列表
package 本章总结; public class A01class { public int ope(int Operator, int num1, int num2) { switch (Operator) { case 1: num1 += num2; break; case 2: num1 -= num2; break; case 3: num1 *= num2; break; case 4: num1 /= num2; break; default: System.out.print