Java SE入门及基础（19）

二维数组

1. 数组的本质

public static void main ( String [] args ) {

????????//定义了一个长度为 10 的二维数组，每一个空间中只能存放长度为 3 的字符串数组

????????String [][] personInfos = new String [ 10 ][ 3 ];

????????//定义了一个长度为 5 的二维数组，每一个空间中只能存放长度为 2 的 double 数组

????????double [][] agesAndScores = new double [ 5 ][ 2 ];

????????agesAndScores [ 0 ] = new double []{ 18 , 60 };

????????agesAndScores [ 1 ] = new double []{ 19 , 65 };

????????agesAndScores [ 2 ] = new double []{ 28 , 90 };

????????agesAndScores [ 3 ] = new double []{ 22 , 55 };

????????agesAndScores [ 4 ] = new double []{ 21 , 60 };

????????//定义了一个长度为 5 的二维数组，每一个空间中可以存放任意长度的字符串数组

????????String [][] infos = new String [ 5 ][];

????????infos [ 0 ] = new String []{ " 刘德华 " };

????????infos [ 1 ] = new String []{ " 张学友 " , " 很牛逼 " };

????????infos [ 2 ] = new String []{ " 张三 " , " 学渣 " , " 整天不务正业 " , " 吃喝嫖赌样样会 " };

}

public static void main ( String [] args ) {

????????String [][] musicInfos = new String [ 5 ][ 3 ];

????????Scanner sc = new Scanner ( System . in );

????????for ( int i = 0 ; i < musicInfos . length ; i ++ ){

????????????????System . out . println ( " 请输入歌曲名称： " );

????????????????String name = sc . next ();

????????????????System . out . println ( " 请输入歌曲歌手： " );

????????????????String singer = sc . next ();

????????????????System . out . println ( " 请输入歌曲出版年月： " );

????????????????String date = sc . next ();

????????????????musicInfos [ i ] = new String []{ name , singer , date };

????????}

}

Java?SE文章参考:Java SE入门及基础知识合集-CSDN博客