更新

2021-07-10 01:50:21 +08:00
parent 4bf855c36d
commit 806de33657
7 changed files with 645 additions and 143 deletions
--- a/Java/code/RefEx.java
+++ b/Java/code/RefEx.java
@@ -0,0 +1,78 @@
+package test;
+
+import static java.lang.System.out;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.lang.reflect.Type;
+import java.lang.reflect.TypeVariable;
+import java.util.ArrayList;
+
+public class RefEx {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		String s="hello";
+		Class c=s.getClass();//获取类型
+		System.out.println(c);
+		String modifiers=Modifier.toString(c.getModifiers());//获取修饰符
+		System.out.println(modifiers);
+		
+		 TypeVariable<?>[] tv = c.getTypeParameters();//获取泛型类型参数
+		    if (tv.length != 0) {
+			out.format("  ");
+			for (TypeVariable<?> t : tv)
+			    out.format("%s ", t.getName());
+			out.format("%n%n");
+		    } else {
+			out.format("  -- No Type Parameters --%n%n");
+		    }
+		    
+		    Class superclass=c.getSuperclass();//获取类型的父类
+		    System.out.println(superclass);
+		    
+		    Type[] intfs = c.getGenericInterfaces();//获取类实现的接口
+		    if (intfs.length != 0) {
+			for (Type intf : intfs)
+			    out.format("  %s%n", intf.toString());
+			out.format("%n");
+		    } else {
+			out.format("  -- No Implemented Interfaces --%n%n");
+		    }
+		    
+		    Annotation[] ann = c.getAnnotations();//获取类的注解
+		    if (ann.length != 0) {
+			for (Annotation a : ann)
+			    out.format("  %s%n", a.toString());
+			out.format("%n");
+		    } else {
+			out.format("  -- No Annotations --%n%n");
+		    }
+		    
+		    Constructor[] cons=c.getDeclaredConstructors();//获取类的构造方法
+		    for(Constructor con:cons){
+		    	System.out.println(con.toGenericString());
+		    	
+		    }
+		    out.format("%n%n");
+		    
+		    Field[] fs=c.getDeclaredFields();//获取类的数据成员（成员变量）
+		    for(Field f:fs){
+		    	System.out.println(f.toGenericString());
+		    	
+		    }
+		    out.format("%n%n");
+		    
+		    Method[] ms=c.getMethods();//获取类的公有成员方法（包含从父类继承的）
+		    for(Method m:ms){
+		    	System.out.println(m.toGenericString());
+		    	
+		    }
+		    out.format("%n%n");
+		    
+	}
+
+}