通过字符串获取实例对象 [英] Get instanced object by String

问题描述

是否有可能在运行时获取代码中由字符串实例化的对象?

Is it possible to get a Object that is instanced in the Code by a String at Runtime?

类似的东西

public String xyz = "aaaa_bbb";

getObject("xyz").some function of String (e.g.: .split("_"))

谢谢

推荐答案

以下是示例

如果它是一个类字段，则可以通过这样的名称来获取它.

If it's a class field, you can get it by name like this.

import java.lang.reflect.Method;


public class Test {


    public String stringInstance = "first;second";

    public void Foo() {


        try {
            Object instance = getClass().getDeclaredField("stringInstance").get(this);
            Method m = instance.getClass().getMethod("split", String.class);

            Object returnValue = m.invoke(instance, ";");
            if(returnValue instanceof String[])
            {
                for(String s : (String[])returnValue )
                {
                    System.out.println(s);
                }
            }

        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public static void main(String a[]){
        new Test().Foo();
    }



}

如果您要调用的是本地方法变量，那么也许可以从调用堆栈Thread.currentThread().getStackTrace()的当前方法中获取该变量.

If it's a local method variable you are trying to invoke on, then you might be able to get at to the variable in from the current method from the call stack Thread.currentThread().getStackTrace() maybe.

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