Java反射

package com.czh.studyday9.reflect;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

/**
* 反射机制
* @author J_X
*
*/

public class ReflectTest {

public static void main(String[] args) {
// TODO Auto-generated method stub
Integer integer = 3;
//获取类的类型
//方式一
Class<?> type1 = integer.getClass();
//方式二
Class<?> type2 = Integer.class;
Class<?> type3 = null;
//方式三java.lang.Integer
try {
type3 = Class.forName("com.czh.studyday5.person.WX");

Method [] temp = type3.getMethods();

for (int i=0; i<temp.length; ++i)
{
Annotation [] tempA= temp[i].getAnnotations();
for (Annotation annotation : tempA) {
System.err.println("Annotation->"+annotation.toString());
}
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

//获取类的方法信息type1.getMethods()
Method[] methods = type1.getDeclaredMethods();
for (int i=0; i<methods.length; ++i) {
Method m = methods[i];
System.out.print(m.getReturnType()+ " ");
System.out.print(m.getName() + "(");
Class<?>[] params = m.getParameterTypes();
for (int j=0; j<params.length; ++j) {
Class<?> p = params[j];
System.out.print(p.getName());
if (j != (params.length -1))
{
System.out.print(", ");
}
}
System.out.println(")");
}
try {
Method m = type3.getDeclaredMethod("testReflect", int.class);
m.setAccessible(true);
System.err.println("getMoney = "+ m.invoke(type3.newInstance(), 10).toString());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//获取类声明变量的方法
Field[] fields= type2.getDeclaredFields();
for (int k = 0; k<fields.length; ++k)
{
System.err.println(fields[k].toGenericString());
}
//获取构造函数
Constructor<?> [] constructors = type2.getConstructors();
for (int i=0; i<constructors.length; ++i)
{
Constructor<?> c = constructors[i];
System.out.print(c.getName()+ "(");
Class<?>[] p =  c.getParameterTypes();
for (Class<?> p1 : p) {
System.out.print(p1.getName() + ",");
}
System.out.println(")");
}
}

}

int numberOfLeadingZeros(int)
int numberOfTrailingZeros(int)
int bitCount(int)
boolean equals(java.lang.Object)
class java.lang.String toString(int, int)
class java.lang.String toString()
class java.lang.String toString(int)
int hashCode(int)
int hashCode()
int min(int, int)
int max(int, int)
int reverseBytes(int)
int compareTo(java.lang.Integer)
int compareTo(java.lang.Object)
byte byteValue()
short shortValue()
int intValue()
long longValue()
float floatValue()
double doubleValue()
class java.lang.Integer valueOf(java.lang.String, int)
class java.lang.Integer valueOf(int)
class java.lang.Integer valueOf(java.lang.String)
class java.lang.String toHexString(int)
int compare(int, int)
class java.lang.Integer decode(java.lang.String)
void getChars(int, int, [C)
int reverse(int)
int stringSize(int)
int sum(int, int)
int parseInt(java.lang.String)
int parseInt(java.lang.String, int)
long toUnsignedLong(int)
int compareUnsigned(int, int)
int divideUnsigned(int, int)
int formatUnsignedInt(int, int, [C, int, int)
class java.lang.Integer getInteger(java.lang.String, java.lang.Integer)
class java.lang.Integer getInteger(java.lang.String, int)
class java.lang.Integer getInteger(java.lang.String)
int highestOneBit(int)
int lowestOneBit(int)
int parseUnsignedInt(java.lang.String)
int parseUnsignedInt(java.lang.String, int)
int remainderUnsigned(int, int)
int rotateLeft(int, int)
int rotateRight(int, int)
int signum(int)
class java.lang.String toBinaryString(int)
class java.lang.String toOctalString(int)
class java.lang.String toUnsignedString(int)
class java.lang.String toUnsignedString(int, int)
class java.lang.String toUnsignedString0(int, int)
getMoney = -10
public static final int java.lang.Integer.MIN_VALUE
public static final int java.lang.Integer.MAX_VALUE
public static final java.lang.Class<java.lang.Integer> java.lang.Integer.TYPE
static final char[] java.lang.Integer.digits
static final char[] java.lang.Integer.DigitTens
static final char[] java.lang.Integer.DigitOnes
static final int[] java.lang.Integer.sizeTable
private final int java.lang.Integer.value
public static final int java.lang.Integer.SIZE
public static final int java.lang.Integer.BYTES
private static final long java.lang.Integer.serialVersionUID
java.lang.Integer(int,)
java.lang.Integer(java.lang.String,)