e118. getting the methods of a class object.txt

来自「这里面包含了一百多个JAVA源文件」· 文本 代码 · 共 23 行

There are three ways of obtaining a Method object from a Class object. 
    Class cls = java.lang.String.class;
    
    // By obtaining a list of all declared methods.
    Method[] methods = cls.getDeclaredMethods();
    
    // By obtaining a list of all public methods, both declared and inherited.
    methods = cls.getMethods();
    for (int i=0; i<methods.length; i++) {
        Class returnType = methods[i].getReturnType();
        Class[] paramTypes = methods[i].getParameterTypes();
        process(methods[i]);
    }
    
    // By obtaining a particular Method object.
    // This example retrieves String.substring(int).
    try {
        Method method = cls.getMethod("substring", new Class[] {int.class});
        process(method);
    } catch (NoSuchMethodException e) {
    }