java – 字符串包含相同的字符但仍然不同

参见英文答案 > Two identical Strings are not equal(Not pointer/reference mistake)1个
我正在尝试读取.txt文件并使用每个句子作为团队的名称,同时使用该名称来寻找另一个.txt文件来获取其内容.所有.txt文件都位于我的assets文件夹的根目录下.第一个.txt文件工作正常,我使用assetmanager.open和readLine()来获取字符串,但是当使用该字符串作为参数来获取第二个.txt时,我得到一个java.io.FileNotFoundException.但是,当使用硬编码字符串调用相同的.txt文件时,一切正常.经过进一步检查,我发现硬编码字符串和用作参数的字符串在使用equals()函数后返回false.

这是调用first.txt的方法

private void loadTeams() {
    try {
        BufferedReader r = new BufferedReader(new InputStreamReader(assetManager.open("matches.txt")));
        String name,bio,trainer;
        for(int i = 0; i < 4; i++){
            name = r.readLine();
            bio = r.readLine();
            trainer = r.readLine();
            System.out.println(name+","+bio+","+trainer);
            teams[i] = new Team(name,i,loadPlayers(name),trainer);
        }
        r.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

使用“name”作为以下方法的参数：

private Player[] loadPlayers(String teamName){
    Player[] players = new Player[11];

    try {
        String path = "team_Netherlands.txt";     //works
        String path2 = "team_"+teamName+".txt";     //doesn't work?
        System.out.println("are "+path+" and " +path2 +" the same? "+path.equals(path2));

        BufferedReader r = new BufferedReader(new InputStreamReader(assetManager.open(path2)));

        //perform operations on the obtained info
        r.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return players;
}

文件中的第一句是“荷兰”(没有引号)
我认为应该导致team_Netherlands.txt为path2变量.
然而,使用它会使应用程序崩溃.使用路径变量它可以正常工作. println确认字符串不相等. (见logcat的第一句)

logcat的：

05-26 11:18:23.152 2960-2960/com.myname.testapp I/System.out: are team_Netherlands.txt and team_Netherlands.txt the same? false
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err: java.io.FileNotFoundException: team_Netherlands.txt
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at android.content.res.AssetManager.openAsset(Native Method)
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at android.content.res.AssetManager.open(AssetManager.java:354)
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at android.content.res.AssetManager.open(AssetManager.java:328)
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at com.myname.testapp.Poule_Activity.load_Players(Poule_Activity.java:144)
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at com.myname.testapp.Poule_Activity.load_Teams(Poule_Activity.java:94)
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at com.myname.testapp.Poule_Activity.onCreate(Poule_Activity.java:53)
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at android.app.Activity.performCreate(Activity.java:5990)
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2332)
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442)
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at android.app.ActivityThread.access$800(ActivityThread.java:156)
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351)
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:102)
05-26 11:18:23.152 2960-2960/com.myname.testapp W/System.err:     at android.os.Looper.loop(Looper.java:211)
05-26 11:18:23.153 2960-2960/com.myname.testapp W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:5373)
05-26 11:18:23.153 2960-2960/com.myname.testapp W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
05-26 11:18:23.153 2960-2960/com.myname.testapp W/System.err:     at java.lang.reflect.Method.invoke(Method.java:372)
05-26 11:18:23.153 2960-2960/com.myname.testapp W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
05-26 11:18:23.153 2960-2960/com.myname.testapp W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)

为什么这些字符串不相等以及如何使它们相等？ (即,使非硬编码字符串等于硬编码字符串)

解决方法

ef bb bf

并且它们在日志输出中不可见.

保存没有BOM的文件,或remove the BOM in your code.

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