: false java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0 at week04.g20200343040172.Main.main(Main.java:9) 1. 2. 3. 4. 5. 6. a.length和 a[0].length 对于二维数组 int[][] a = {}; int[][] b = {{}}; 1. 2. a.length打印的是二维矩阵的行的数量...