1 import java.lang.reflect.Method;
2
3 /**
4 * Created by Q_先森 on 2017/12/12.
5 */
6 public class MethodTest {
7
8
9 static void staticMethod() {
10 System.out.println("执行staticMethod()方法");
11 }
12
13 public int publicMethod(int i) {
14 System.out.println("执行publicMethod()方法");
15 return i * 20;
16 }
17
18 protected int protectedMethod(String s, int i) throws NumberFormatException {
19 System.out.println("执行protectedMethod()方法");
20 return Integer.valueOf(s) + i;
21 }
22
23 private String privateMethod(String... strings) {
24 System.out.println("执行privateMethod()方法");
25 StringBuffer stringBuffer = new StringBuffer();
26 for (int i = 0; i < strings.length; i++) {
27 stringBuffer.append(strings[i]);
28 }
29 return stringBuffer.toString();
30 }
31
32 public static void main(String[] args) {
33 //实例化一个对象：
34 MethodTest methodTest = new MethodTest();
35 //获得所有的方法
36 Method[] declaredMethods = MethodTest.class.getDeclaredMethods();
37 for (int i = 0; i < declaredMethods.length; i++) {
38 Method method = declaredMethods[i];
39 System.out.println("名称：" + method.getName()); //方法名称
40 System.out.println("是否允许带有可变参数变量:" + method.isVarArgs());
41 System.out.println("入口参数类型依次为：");
42 //获得方法所有的参数类型
43 Class[] parameterTypes = method.getParameterTypes();
44 for (int j = 0; j < parameterTypes.length; j++) {
45 System.out.println("parameterTypes[" + j + "]" + parameterTypes[j]);
46 }
47
48 System.out.println("返回值类型：" + method.getReturnType()); //获得方法返回值类型
49 System.out.println("可能抛出异常类型有：");
50 Class[] exceptionTypes = method.getExceptionTypes(); //获得可能抛出的所有异常类型
51 for (int j = 0; j < exceptionTypes.length; j++) {
52 System.out.println("exceptionTypes[" + j + "]" + exceptionTypes[j]);
53 }
54
55 boolean isTurn = true;
56 while (isTurn) {
57 try {
58 isTurn = false;
59 if (i == 1) {// 这里i=0 是main方法
60 method.invoke(methodTest);
61 } else if (i == 2) {
62 System.out.println("返回值：" + method.invoke(methodTest, 5));
63 } else if (i == 3) {
64 System.out.println("返回值：" + method.invoke(methodTest, "7", 5));
65 } else if (i == 4) {
66 Object[] parameters = new Object[]{new String[]{"M", "W", "Q"}};
67 System.out.println("返回值：" + method.invoke(methodTest, parameters));
68 }
69 } catch (Exception e) {
70 System.out.println("在执行方法时抛出异常,执行setAccessible()方法");
71 method.setAccessible(true);
72 isTurn = true;
73 }
74 }
75 System.out.println("============================割============================");
76 }
77 }
78 }
