Question

我有一个带有方法的类，它返回一个字符串。如果我创建一个对象并调用该方法，则该对象包含该类的ID（com.ma.singhalja.testclass.greeting@99e92d）

package com.ma.singhalja.testclass;

import android.app.Application;


public class greeting extends Application{

    String sayHello(){
        return "Hello!";
    }
}

我的主要活动：

package com.ma.singhalja.testclass;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        greeting Hello = new greeting();
        Hello.sayHello();
        System.out.println(Hello);
    }
}

日志： I / System.out:com.ma.singhalja.testclass.greeting@99e92d

任何人都可以告诉我们如何实际获得String＆＃34; Hello＆＃34;进入对象？我已经尝试使用.toString（）转换为String。

谢谢！

Answer 1

从技术上讲，你不打印好东西：

System.out.println(Hello.sayHello());

这会输出System.out.println(...) Hello.sayHello()的结果Hello!，System.out.println(Hello);。如果您执行Class，则表示您正在尝试打印Greeting。

顺便说一下：

一般来说，班级为大写greeting而不是Application
实例化 getApplication()在Android中效果不佳。这是平台那。使用System.out.println(...)
Log.d(...)这不是Android-thing ...你可以使用 SELECT tp.d_id , u.email , ta.email_subject AS headline , ta.start_date , ta.closing_date , tp.call_cost , SUM(tpc.duration) AS duration , COUNT(tpc.id) AS call_count , ta.currency , ( SELECT MIN(hr) KEEP ( DENSE_RANK LAST ORDER BY cnt, max_duration, l_id ) AS most_pop_call_start FROM ( SELECT EXTRACT(HOUR FROM started) AS hr, count(*) AS cnt , SUM(duration) AS duration , MAX(duration) AS max_duration , phone_number_id AS l_id FROM table_phone_call GROUP BY EXTRACT(HOUR FROM started), phone_number_id ) where l_id = tpc.phone_number_id ) AS most_pop_call_start --, STATS_MODE(extract(HOUR from tpc.started)) AS most_pop_call_start , AVG(tpc.duration) AS avg_duration , tb.name AS business_name FROM table_a ta JOIN table_phone tp ON ta.id = tp.d_id JOIN table_phone_call tpc ON tp.phone_id = tpc.phone_number_id JOIN table_b tb ON ta.business_id = tb.id JOIN users u ON tb.id = u.business_id WHERE phone_id IS NOT NULL AND TRUNC(ta.closing_date) = to_date('#{jobParameters['dateCriteria']}', 'dd-mm-yyyy') GROUP BY tp.d_id , ta.email_subject , ta.start_date , ta.closing_date , tp.call_cost , tpc.phone_number_id , u.email , ta.currency , tb.name用于调试

Android：Object包含class-ID

1 个答案: