Java Class getGenericInterfaces() 方法

2025 年 3 月 21 日 | 阅读 2 分钟

java Class 类的 getField() 方法以 Type 类型的数组的形式返回由类或接口直接实现的接口的 Type。

语法

参数

不适用

返回值

一个数组。

抛出

GenericSignatureFormatError, TypeNotPresentException MalformedParameterizedTypeException

示例 1

//import statements
  
import java.lang.reflect.*;

public class ClassgetGenericInterfacesExample1 {

   public static void main(String []args) {         

      ClassgetGenericInterfacesExample1 obj = new ClassgetGenericInterfacesExample1();
      Class cls = obj.getClass();

      Type[] tp = cls.getGenericInterfaces();
      if(tp.length != 0) {
         for(Type i : tp) {
            System.out.println(i.toString());  //converting I to string
         }
      } else {
         System.out.println("No interfaces impleamented...");  //print statement
      }
   }
}

输出

No interfaces impleamented...

示例 2

//import statements
  
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.math.BigInteger;

public class ClassgetGenericInterfacesExample2 {

    public static void main(String... args) {
        Class<SampleClass> cls = SampleClass.class;
        Type[] gentp = cls.getGenericInterfaces();
        for (Type gen : gentp) {
            System.out.println(gentp);
            Type(gen);
        }
    }

      private static void Type(Type tpp) {
        if (tpp instanceof Class) {
            System.out.println("type is Class");
            System.out.println("class name: " + ((Class) tpp).getSimpleName());
        } else if (tpp instanceof ParameterizedType) {
            System.out.println("type is ParameterizedType");
            Type[] a = ((ParameterizedType) tpp).getActualTypeArguments();
            System.out.println("printing each one of ActualTypeArguments:");
            System.out.println("----");
            for (Type type1 : a) {
                Type(type1);
            }
            System.out.println("----");
        } else if (tpp instanceof TypeVariable) {
            System.out.println("type is TypeVariable");
            String typeVariableName = ((TypeVariable) tpp).getName();
            System.out.println("typeVariableName: " + typeVariableName);

        } else if (tpp instanceof GenericArrayType) {
            System.out.println("type is GenericArrayType");
            Type genericComponentType =
                    ((GenericArrayType) tpp).getGenericComponentType();
            Type(genericComponentType);
        }
    }

    private static class SampleClass implements Interface1<String, BigInteger> {}

    private static interface Interface1<T, R> {}
}

输出

[Ljava.lang.reflect.Type;@7852e922
type is ParameterizedType
printing each one of ActualTypeArguments:
----
type is Class
class name: String
type is Class
class name: BigInteger
----

下一个主题Java类

Java Class getGenericInterfaces() 方法

语法

参数

返回值

抛出

示例 1

示例 2

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Java Class getGenericInterfaces() 方法

语法

参数

返回值

抛出

示例 1

示例 2

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