java reflect反射获取方法变量参数

  • Z时代
  • 2024-01-10
  • 分类：综合

java

类的成员包含变量（Field）,方法（Method），构造器（Constructor）

类定义

package Reflect;
public class MyTest {
    public int a;
    public static int b;
    public static final int c = 0;
    private int d;
    public int sum(int a, int b, String c) {
        return a + b;
    }
    public int sub(int a, int b, String c) {
        return a - b;
    }
    MyTest() {
    }
    MyTest(int a, int b) {
    }
}

1.获取变量

package Reflect;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public class Test {
    public static void main(String[] args) {
        System.out.println(MyTest.class);
        final Class<?> clazz = MyTest.class;
        System.out.println(clazz.getClass());
        final Field[] fields = clazz.getDeclaredFields();
        System.out.println("====print fields===");
        for (final Field f : fields) {
            System.out.print(f.getName() + "->");
            System.out.print(f.getModifiers() + "->");
            System.out.println(Modifier.toString(f.getModifiers()));
        }
}
输出：
class Reflect.MyTest
class java.lang.Class
====print fields===
a->1->public
b->9->public static
c->25->public static final
d->2->private


2.获取方法

package Reflect;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public class Test {
    public static void main(String[] args) {
        System.out.println(MyTest.class);
        final Class<?> clazz = MyTest.class;
        System.out.println(clazz.getClass());
        final Field[] fields = clazz.getDeclaredFields();
        System.out.println("====print Method===");
        final Method[] ms = clazz.getMethods();
        for (final Method m : ms) {
            System.out.println();
            System.out.print(m.getName() + "==||");
            System.out.print(m.getReturnType().getName() + "==||");
            for (final Class o : m.getParameterTypes()) {
                System.out.print(",==" + o.getName());
            }
        }
    }
}
输出:
====print Method===
sum==||int==||,==int,==int,==java.lang.String
sub==||int==||,==int,==int,==java.lang.String
wait==||void==||
wait==||void==||,==long,==int
wait==||void==||,==long
hashCode==||int==||
getClass==||java.lang.Class==||
equals==||boolean==||,==java.lang.Object
toString==||java.lang.String==||
notify==||void==||
notifyAll==||void==||

3.获取构造器

package Reflect;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public class Test {
    public static void main(String[] args) {
        System.out.println(MyTest.class);
        final Class<?> clazz = MyTest.class;
        System.out.println(clazz.getClass());
        System.out.println();
        System.out.println("====print Constructor===");
        final Constructor[] cs = clazz.getDeclaredConstructors();
        for (final Constructor c : cs) {
            System.out.println();
            System.out.print(c.getName());
            for (final Class o : c.getParameterTypes()) {
                System.out.print(",==" + o.getName());
            }
        }
    }
}

输出：
====print Constructor===
Reflect.MyTest 
Reflect.MyTest,==int,==int

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