在 Java 中捕获特定线程的控制台输出

I have part of the code already, but I'm not sure how to capture the console output, and on top of that, how to only capture it for *this specific thread. Here's what I have so far:

public class Output extends Thread {
    private Class testClass;

    public Output(Class clazz) {
        this.testClass = clazz;
    }

    private Method getMainMethod(Class clazz) {
        Method[] methods = clazz.getMethods();
        for (Method method : methods) {
            if (isMainMethod(method)) { 
                return method;
            }
        }

        return null;
    }

    private Boolean isMainMethod(Method method) {
        return (method.getName().equals("main") &&
                Modifier.isStatic(method.getModifiers()) &&
                method.getReturnType().equals(Void.class));
    }

    public void run() {
        Method mainMethod = null;

        if ((mainMethod = getMainMethod(this.testClass)) == null) {
            //if there's no static void main method, throw exception
            throw new YouFuckedItUpException();
        }

        mainMethod.invoke(this.testClass, new String[0]);

        return heresWhereImStuckIWantToCaptureTheConsoleOutputAndReturnIt();
    }
}

我所需要的只是一些代码或指向如何获取所调用方法的 System.out 和 System.err 输出的答案的链接.任何人都可以提供任何帮助将不胜感激.