Question

我一直坚持这个问题，我得到错误：

class, interface or enum expected

任何帮助将不胜感激？我一直坚持这个问题，我的朋友们无法弄明白。

这是代码：

package com.example.vengelen.knitting;

import android.app.Activity;

import android.content.Context;    
import android.content.Intent;
import android.os.Bundle;

import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;

import android.widget.TextView;

import android.widget.Button;

import android.view.View;
import android.widget.Toast;


public class Rectangular extends ActionBarActivity {

    EditText amount1;
    EditText amount2;
    EditText amount3;
    TextView tt;
    Button calculate;
    double w=0;
    double x=0;
    double y=0;
    double z=0;
     /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rectangular);
        initControls();
    }
private void initControls()
{
    amount1=(EditText)findViewById(R.id.editText);
    amount2=(EditText)findViewById(R.id.editText3);
    amount3=(EditText)findViewById(R.id.editText2);
    tt=(TextView)findViewById(R.id.editText4);
    calculate=(Button)findViewById(R.id.button9);
    calculate.setOnClickListener(new Button.OnClickListener()
    {public void onClick
                (View  v) { calculate();}});
    }
    EditText input;
    EditText output;
    Button one;


    private void calculate()
    {
    w=Double.parseDouble(amount3.getText().toString());
    x=Double.parseDouble(amount1.getText().toString());
    y=Double.parseDouble(amount2.getText().toString());
    z=(x+y)*(y+w);
    tt.setText(Double.toString(z));
}





}

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


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_selector, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
         // Handle action bar item clicks here. The action bar will
         // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

Answer 1

您在方法onCreate之前有不必要的结束括号：

 }
 ^^
@Override
protected void onCreate(Bundle savedInstanceState)

这意味着编译器认为通过该大括号，您的类定义已经完成，然后看到一个新的方法定义应该在另一个类中，因此抱怨相同。作为最佳实践，您应始终格式化代码。

错误：在void处期望的类，接口或枚举

1 个答案: