Question

我正在尝试使用consoleDroid初始化类consoleDroid console = new consoleDroid();的实例，但它会抛出class, interface, or enum expected编译错误。什么是初始化课程的正确方法？

caseSelector.java：

package com.caseselector;

import android.app.Activity;
import android.os.Bundle;

consoleDroid console = new consoleDroid();

public class caseSelector extends Activity
{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        console.create();
    }
}

consoleDroid.java：

package com.caseselector;

import android.view.View;
import android.widget.TextView;
import android.widget.EditText;
import android.widget.Button;

public class consoleDroid {

    private static String output;
    private Button consoleButton;
    private TextView consoleView;
    private EditText consoleInput;

    public static void create() {
    }

    public static void write(String input) {
    }

    public static void writeLine(String input) {
    }

    public static String readLine(boolean print) {
        return output;
    }
}

Answer 1

只需将实例化移动到类主体中：

public class caseSelector extends Activity
{
    consoleDroid console = new consoleDroid();
    // ...
}

顺便说一句：根据惯例，类名应以大写字母开头。

Answer 2

你必须在类中进行实例化。如果Java类以大写字母开头，那么Java类看起来会更好。

public class caseSelector extends Activity
{
    consoleDroid console = new consoleDroid();

    /** Called when the activity is first created. */
    ....
}

Answer 3

首先，按惯例，类应以大写字母开头。你问题的答案 - consoleDroid console = new consoleDroid();并不合适。它必须位于类中的某个位置 - 方法或构造函数。

Answer 4

您的代码不在课堂上。把

consoleDroid console = new consoleDroid();

在课堂内......

初始化一个类实例？

4 个答案: