今天我们要开始来讲讲Java中的数组,包括一维数组和二维数组的静态初始化和动态初始化
数组概述:
数组可以看成是多个相同类型数据的组合,对这些数据的统一管理;
数组变量属于引用数据类型,数组也可以看成是对象,数组中的每一个元素相当于该对象的成员变量;
数组中的元素可以是任何数据类型,包括基本数据类型和引用数据类型;
一维数组的声明:
声明方式: 例如; int a [ ] = new int [3];
Java语言中 声明是不能指定其长度[数组中元素的个数];
非法声明; int a [5];
数组对象的创建:
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public class Test { public static void main (String args[ ] ) { int [ ] s; s = new int [5]; for(int i = 0; i < 5; i ++) { s[i] = 2 * i + 1; } }} |
一维数组初始化
动态初始化:
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public class Test { public static void main (String args [ ] ) { int a [ ]; a = new int [3]; //int a [ ] = {1,2,3}; Date days [ ]; days = new Date [3]; days [0] = new Date(1,4,20040); days [1] = new Date(2,4,20040); days [2] = new Date(3,4,20040); }}class Date { int year,month,day; Date (int y,int m,int d) { year = y; month = m; day = d; }} |
静态初始化
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public class Test { public static void mian (String args [ ] ) { int a[ ] = new int [ ] {3,9,8}; Date days[ ] = { new Date(1,4,2004), new Date(2,4,2004), new Date(3,4,2004) }; }}class Date { int year,month,day; Date(int y,int m,int d) { year = y; month = m;day = d; }} |
二维数组
二维数组可以看成数组为元素的数组,例如:
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int a [ ][ ] = {{1,2},{3,4,5,6},{7,8,9}}; |
二维数组初始化
静态初始化:
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int intA [ ] [ ] = {{1,2},{2,3},{3,4,5}}; int intB [ 3] [ 2] = {{1,2},{2,4},{4,5}}; 非法 |
动态初始化:
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int a [ ] [ ] = new int [3] [5]; int b [ ] [ ] = new int [3] [ ]; b[0] = new int [2]; b[1] = new int [3]; b[2] = new int [5]; |
原文链接：http://www.cnblogs.com/Java-zhitu/archive/2017/10/18/7686950.html
