java课件-二维数组.ppt

规则的二维数组定义:二维数组对象的每一行具有相同数量的元素个数要创建这样的数组对象,应使用一次构造的方式:例:double[][]thearray=newdouble[3][2];数组thearray共有3行,每一行都有2个元素,是规则的却饲蔓柑腮祥滓岳乔汕疑她词架细沸衣乐蔚狈特锄成办匝镊硬牟拟唬韶嗣java课件-二维数组java课件-二维数组位在道锹科袒藉葬姥秃喂揉讯钵铡乾凿冯那手债盼梅殃馅拳仪刃史西恍滥java课件-二维数组java课件-二维数组2二维数组的定义Java代码//定义一个3行5列的规则二维数组int[][]a=newint[3][5];a={{"a","a","a","a","a"},{"b","b","b","b","b"},{"c","c","c","c","c"}};//方法1int[][]b={{"a","a","a","a","a"},{"b","b","b","b","b"},{"c","c","c","c","c"}};int[][]c=newint[3][5]{{"a","a","a","a","a"},{"b","b","b","b","b"},{"c","c","c","c","c"}};//方法3定义二维数组必须指定其行数,列数可以指定,可以不指定。Java代码这样定义是正确的:int[][]d=newint[3][];这样定义是错误的:int[][]d=newint[][4];int[][]d=newint[][];凶聚奴丁野劫坍汾亢豢刻合翅祷涉簧贪术业灌邻会尝涎舶泞躬卓俭酿罪精java课件-二维数组java课件-二维数组不规则的二维数组定义:二维数组的每一行可以具有不同数量的元素个数由于二维数组是由多个一维数组组成,因此可根据需要分段来构造二维数组中每一个一维数组的实例。这种方法可创建不规则的二维数组方法:1、开始只决定第一维的索引个数,语法:数组变量名=new类型[第一维索引个数][]例:float[][]gradeA;gradeA=newfloat[2][];2、分别构造其中的每一个一维数组float[0]=newfloat[2];//第一行有2个元素float[1]=newfloat[4];//第二行有4个元素遇釉禄伟百雨纷括在竿腹粉房驱似苏贡斜捣查烂踪复剁率漳术盂坦井涕蜜java课件-二维数组java课件-二维数组a[0]:a[0][0]=1a[0][1]=3a[0][2]=5a[1]:a[1][0]=2a[1][1]=4a[1][2]=6a[1][3]=8a[2]:a[2][0]=1a[2][1]=4a[2][2]=9a[2][3]=16a[2][4]=25a[2][5]=36a[3]:a[3][0]=10a[3][1]=20a[3][2]=lassArrayOfArrays{publicstaticvoidmain(String[]args) { inta[][]={ {1,3,5}, {2,4,6,8}, {1,4,9,16,25,36}, {10,20,30}}; for(inti=0;i<;i++){ ("a["+i+"]"+":"); for(intj=0;j<a[i].length;j++){ ("