package generic.portal;/** * Created by Administrator on 2017/1/10. */public interface GenericInterface<T> {}package generic.portal;import java.lang.reflect.ParameterizedType;import java.lang.reflect.Type;import java.lang.reflect.TypeVariable;/** * Created by Administrator on 2017/1/10. */public class GenericParent<T,K> { public Class<T> entityClass; public GenericParent(){ TypeVariable[] tValue = GenericParent.class.getTypeParameters(); System.out.println(tValue[0].getName()); System.out.println(getClass().getName()); Type t = getClass().getGenericSuperclass(); System.out.println(t); System.out.println(t.getClass().getName()); entityClass = (Class<T>)((ParameterizedType)t).getActualTypeArguments()[0]; System.out.println(entityClass.getName()); } public static void main(String[] args){ GenericParent<String,Integer> obj = new GenericParent<String,Integer>(); }}package generic.portal;import com.google.gson.GsonBuilder;import java.lang.reflect.*;import java.util.HashMap;import java.util.List;import java.util.Map;/** * Created by Administrator on 2017/1/10. */public class GenericTest extends GenericParent<String, Integer> implements GenericInterface<Double> { private static Class getClass(Type type, int i) { if (type instanceof ParameterizedType) { // 处理泛型类型 System.out.println("1111111"); return getGenericClass((ParameterizedType) type, i); } else if (type instanceof TypeVariable) { System.out.println("--------" + ((Class) getClass(((TypeVariable) type).getBounds()[0], 0)).getName()); return (Class) getClass(((TypeVariable) type).getBounds()[0], 0); // 处理泛型擦拭对象 } else {// class本身也是type，强制转型 return (Class) type; } } private static Class getGenericClass(ParameterizedType parameterizedType, int i) { Object genericClass = parameterizedType.getActualTypeArguments()[i]; if (genericClass instanceof ParameterizedType) { // 处理多级泛型 System.out.println("111111"); return (Class) ((ParameterizedType) genericClass).getRawType(); } else if (genericClass instanceof GenericArrayType) { // 处理数组泛型 return (Class) ((GenericArrayType) genericClass).getGenericComponentType(); } else if (genericClass instanceof TypeVariable) { // 处理泛型擦拭对象 System.out.println("33333333"); return (Class) getClass(((TypeVariable) genericClass).getBounds()[0], 0); } else { System.out.println("444444"); return (Class) genericClass; } } public String[] getPayments(String[] payments,Integer[] sss, List<TodoInfo> products){ return payments; } public static void main(String[] args) { GenericTest obj = new GenericTest(); System.out.println(obj.getClass()); Type[] a = obj.getClass().getGenericInterfaces(); Type b = obj.getClass().getGenericSuperclass(); System.out.println("//zhoushun "); //interface for (Type t : a) { Type[] temp = ((ParameterizedType) t).getActualTypeArguments(); for (Type c : temp) { System.out.println(); System.out.println(((Class) c).getName()); } } TypeVariable[] v = obj.getClass().getSuperclass().getTypeParameters(); for (TypeVariable vv : v) { System.out.println(vv.getName()); Type[] tt = vv.getBounds(); for (Type c : tt) { System.out.println(((Class) c).getName()); } } //super Type[] temp = ((ParameterizedType) b).getActualTypeArguments(); for (Type c : temp) { System.out.println(((Class) c).getName()); } Map map = new HashMap(); map.put("a",null); map.put(1,""); map.put("das","asd"); map.put("dasdsa","<a href='dasdsa'>"); System.out.println(new GsonBuilder().serializeNulls().disableHtmlEscaping().create().toJson(map));// List<?>[] lsa = new List<?>[10]; // OK, array of unbounded wildcard type.// Object o = lsa;// Object[] oa = (Object[]) o;// List<Integer> li = new ArrayList<Integer>();// li.add(new Integer(3));// oa[1] = li; // Correct.// String s = (String) lsa[1].get(0); // Run time error, but cast is explicit.// System.out.println(s); Method getPayments = null; try { getPayments = GenericTest.class.getMethod("getPayments", new Class[]{String[].class,Integer[].class, List.class}); } catch (NoSuchMethodException e) { e.printStackTrace(); } Type[] types = getPayments.getGenericParameterTypes(); System.out.println("The first parameter of this method is GenericArrayType."+ types[0].getClass()); ParameterizedType gType = (ParameterizedType)types[2]; System.out.println("The GenericArrayType's component is String." +((Class)gType.getActualTypeArguments()[0]).getName()); }}package generic.portal;/** * Created by Administrator on 2017/1/10. */public class TodoInfo {}输出：
Connected to the target VM, address: '127.0.0.1:53345', transport: 'socket'
T
generic.portal.GenericTest
generic.portal.GenericParent<java.lang.String, java.lang.Integer>
sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl
java.lang.String
class generic.portal.GenericTest
//zhoushun
java.lang.Double
T
java.lang.Object
K
java.lang.Object
java.lang.String
java.lang.Integer
{"das":"asd","1":"","a":null,"dasdsa":"<a href='dasdsa'>"}
The first parameter of this method is GenericArrayType.class java.lang.Class
The GenericArrayType's component is String.generic.portal.TodoInfo
Disconnected from the target VM, address: '127.0.0.1:53345', transport: 'socket'
Process finished with exit code 0
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