定义4行5列的二维数组答:import java.io.File;import java.io.FileWriter;import java.io.IOException;public class Test2DArray { // 初始化 private int[][] a = new int[][] { { 85, 90, 94, 86, 78 }, { 88, 89, 87, 76, 90 }, { 92, 97, 90, 89, 80 }, { 99, 78, 85, 67, 96 ...