十一、操作数组
int tmp[] = {1,2,3};
Class<?> c = tmp.getClass().getComponentType();
Array.getLength(tmp); //tmp数组的长度
c.getName(); //获得数组类型名称
Array.get(Object obj,int index); //获得obj数组的index索引的数值
Array.set(Object obj,int index,VALUE); //设置obj数组的index索引的数值为value；
Object obj = Array.newInstance(c,length); //c为数组的类型，length为数组的长度；obj为返回的数组对象；
import java.lang.reflect.*; public class GetMethodDemo01{ public static void main(String args[])throws Exception{ Class<?> c1 = Class.forName("Person"); Method m = c1.getMethod("sayHello"); m.invoke(c1.newInstance()); Method m2 = c1.getMethod("sayHello2",String.class,int.class); String str = (String)m2.invoke(c1.newInstance(),"xiazdong",123); System.out.println(str); Field nameField = c1.getDeclaredField("name"); Field ageField = c1.getDeclaredField("age"); nameField.setAccessible(true); ageField.setAccessible(true); Person obj = (Person)c1.newInstance(); obj.setName("xzdong"); obj.setAge(12); System.out.println(nameField.get(obj)); System.out.println(ageField.get(obj)); Method setName = c1.getMethod("setName",String.class); setName.invoke(obj,"changed"); Method getName = c1.getMethod("getName"); System.out.println(getName.invoke(obj)); int tmp[] = {1,2,3}; Class<?> c3 = tmp.getClass().getComponentType(); System.out.println(c3.getName()); System.out.println("第一个数："+Array.get(tmp,0)); Array.set(tmp,0,5); System.out.println("第一个数："+Array.get(tmp,0)); Object arr = Array.newInstance(c3,5); System.arraycopy(tmp,0,arr,0,Array.getLength(tmp)); System.out.println(Array.get(arr,2)); System.out.println(Array.get(arr,3)); } }
import java.lang.reflect.*; public class GetMethodDemo01{ public static void main(String args[])throws Exception{ Class<?> c1 = Class.forName("Person"); Method m = c1.getMethod("sayHello"); m.invoke(c1.newInstance()); Method m2 = c1.getMethod("sayHello2",String.class,int.class); String str = (String)m2.invoke(c1.newInstance(),"xiazdong",123); System.out.println(str); Field nameField = c1.getDeclaredField("name"); Field ageField = c1.getDeclaredField("age"); nameField.setAccessible(true); ageField.setAccessible(true); Person obj = (Person)c1.newInstance(); obj.setName("xzdong"); obj.setAge(12); System.out.println(nameField.get(obj)); System.out.println(ageField.get(obj)); Method setName = c1.getMethod("setName",String.class); setName.invoke(obj,"changed"); Method getName = c1.getMethod("getName"); System.out.println(getName.invoke(obj)); int tmp[] = {1,2,3}; Class<?> c3 = tmp.getClass().getComponentType(); System.out.println(c3.getName()); System.out.println("第一个数："+Array.get(tmp,0)); Array.set(tmp,0,5); System.out.println("第一个数："+Array.get(tmp,0)); Object arr = Array.newInstance(c3,5); System.arraycopy(tmp,0,arr,0,Array.getLength(tmp)); System.out.println(Array.get(arr,2)); System.out.println(Array.get(arr,3)); } }
import java.lang.reflect.*; interface China{ public static final String NAME = "CHINA"; public int AGE = 60; public void sayHello(); public String sayHello2(String name,int age); } class Person implements China{ private String name; private int age; public String getName(){ return name; } public void setName(String name){ this.name = name; } public int getAge(){ return age; } public void setAge(int age){ this.age = age; } public void sayHello(){ System.out.println(NAME+" "+AGE); } public String sayHello2(String name,int age){ return name+" "+age; } }
import java.lang.reflect.*; interface China{ public static final String NAME = "CHINA"; public int AGE = 60; public void sayHello(); public String sayHello2(String name,int age); } class Person implements China{ private String name; private int age; public String getName(){ return name; } public void setName(String name){ this.name = name; } public int getAge(){ return age; } public void setAge(int age){ this.age = age; } public void sayHello(){ System.out.println(NAME+" "+AGE); } public String sayHello2(String name,int age){ return name+" "+age; } }
