004 java | Class.forName

目录

使用方法

可以使用继承类

ClassA classA =
 (ClassA)Class.forName("ClassA").getConstructor(ClassB.class).newInstance(classB)

forName

@CallerSensitive
    public static Class<?> forName(String var0) throws ClassNotFoundException {
        Class var1 = Reflection.getCallerClass();
        return forName0(var0, true, ClassLoader.getClassLoader(var1), var1);
    }

getConstructor

    @CallerSensitive
    public Constructor<T> getConstructor(Class... var1) throws NoSuchMethodException, SecurityException {
        this.checkMemberAccess(0, Reflection.getCallerClass(), true);
        return this.getConstructor0(var1, 0);
    }

newInstance

@CallerSensitive
    public T newInstance(Object... var1) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
        if (!this.override && !Reflection.quickCheckMemberAccess(this.clazz, this.modifiers)) {
            Class var2 = Reflection.getCallerClass();
            this.checkAccess(var2, this.clazz, (Object)null, this.modifiers);
        }

        if ((this.clazz.getModifiers() & 16384) != 0) {
            throw new IllegalArgumentException("Cannot reflectively create enum objects");
        } else {
            ConstructorAccessor var4 = this.constructorAccessor;
            if (var4 == null) {
                var4 = this.acquireConstructorAccessor();
            }

            Object var3 = var4.newInstance(var1);
            return var3;
        }
    }