java - Do we need to declare interface methods as abstract -

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संभव डुप्लिकेट: 

  सार्वजनिक इंटरफ़ेस फ़ू {सार सार्वजनिक शून्य बार (); }   
 मुझे लगता है कि हमें  सार  और साथ ही उपरोक्त  इंटरफ़ेस  में घोषित करने की आवश्यकता नहीं है। क्या कम्पाइलर पकड़ यह एक चेतावनी के रूप में है या क्या यह संकलक द्वारा अनुमत है।   
 
 
 आपको नहीं करना पड़ता है, हर इंटरफ़ेस विधि निहित है  सार  यद्यपि इसे लिखने में कोई गलती नहीं होगी।

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