SharedPreferences 读取xml值是否无法在程式里执行

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SharedPreferences prefs3 =PreferenceManager.getDefaultSharedPreferences(this);
         String listp = prefs3.getString("alertlist", "1");
                 
        if(listp=="1"){
          timer=new Timer();
         timer.schedule(new mediatime(), 1000);
                 if(listp=="2"){
          timer=new Timer();
         timer.schedule(new mediatime(), 2000);}
        
        if(listp=="3"){
          timer=new Timer();
         timer.schedule(new mediatime(), 3000);}
        
        if(listp=="4"){
        timer=new Timer();
         timer.schedule(new mediatime(), 4000);}
        
        if(listp=="5"){
          timer=new Timer();
         timer.schedule(new mediatime(), 5000);}
        }

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SharedPreferences prefs3 =PreferenceManager.getDefaultSharedPreferences(this); String listp = prefs3.getString("alertlist", "1"); if(listp.equals("1")){ timer=new Timer(); timer.schedule(new mediatime(), 1000);} if(listp.equals("2")){ timer=new Timer(); timer.schedule(new mediatime(), 2000);} if(listp.equals("3")){ timer=new Timer(); timer.schedule(new mediatime(), 3000);} if(listp.equals("4")){ timer=new Timer(); timer.schedule(new mediatime(), 4000);} if(listp.equals("5")){ timer=new Timer(); timer.schedule(new mediatime(), 5000);}