《Java语言程序设计：基础篇》课后复习题答案-第七章

Chapter7MultidimensionalArrays1int[][]m=newint[4][5];2Yes.Theyareraggedarray.3array[0][1]is2.4.int[][]r=newint[2];Answer:Invalidint[]x=newint[];Answer:Invalidint[][]y=newint[3][];Answer:Valid5.Whydoestheis1To9methodneedtocopylisttotemp?Becauseweneedtosortlist.Sortinglistwillchangethecontentsoflist.Thiswillchangethecontentsofgridafterinvokingis1To9(grid[i]).Whathappensifyoureplacethecodeinlines66-70inListing7.4withthefollowingcode:java.util.Arrays.sort(list);Thecontentsingridarechanged.Consequently,youcannotcheckcolumnsandsmallboxesusingthealteredgrid.6.int[][][]m=newint[4][6][5];