Arrays with trailing commas inside an array initializer in Java

Array initializers can be used to initialize arrays at compile-time. An initializer with trailing commas as shown below compiles fine. ``` int a[][] = {{1,2,} ,{3,4,} , {5,6,},}; //Trailing commas cause no compiler error for(int i=0;i<a.length;i++) { for(int j=0;j<2;j++) { System.out.print(a[i][j]+"\t"); } System.out.println(); } ``` Output : ``` 1 2 3 4 5 6 ``` Also legal with one dimension arrays as obvious with the above discussion. ``` int[] b = {1, 2, 3, 4, 5, 6,}; //A trailing comma causes no compiler error for(int i=0;i<b.length;i++) { System.out.print(b[i]+"\t"); } ``` Output : ``` 1 2 3 4 5 6 ``` Even the following is a legal syntax and compiles fine. ``` int c[][] = {{,} ,{,} , {,},}; ``` The compiler should expect a constant value (or another initializer) after and before a comma `,`. How is this compiled? Does the compiler simply ignore such commas or something else happens in such a scenario?