我可以获取一个类的所有方法吗?

2022-08-31 17:27:18

假设我有一个.class文件,我可以得到该类中包含的所有方法吗?


答案 1

直接从源代码:http://java.sun.com/developer/technicalArticles/ALT/Reflection/ 然后我将其修改为独立,不需要命令行提供任何内容。;-)

import java.lang.reflect.*;

/** 
Compile with this:
C:\Documents and Settings\glow\My Documents\j>javac DumpMethods.java

Run like this, and results follow
C:\Documents and Settings\glow\My Documents\j>java DumpMethods
public void DumpMethods.foo()
public int DumpMethods.bar()
public java.lang.String DumpMethods.baz()
public static void DumpMethods.main(java.lang.String[])
*/

public class DumpMethods {

    public void foo() { }

    public int bar() { return 12; }

    public String baz() { return ""; }

    public static void main(String args[]) {
        try {
            Class thisClass = DumpMethods.class;
            Method[] methods = thisClass.getDeclaredMethods();

            for (int i = 0; i < methods.length; i++) {
                System.out.println(methods[i].toString());
            }
        } catch (Throwable e) {
            System.err.println(e);
        }
    }
}

答案 2

要了解所有方法,请在控制台中使用以下语句:

javap -cp jar-file.jar packagename.classname

javap class-file.class packagename.classname

或例如:

javap java.lang.StringBuffer