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Java经典编程习题100例：第20例：求一个3*3矩阵对角线元素之和

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Java经典编程习题100例：第19例：要求定义一个int型数组a,包含100个元素,保存100个随机的4位数。再定义一个 int型数组b，包含10个元素。统计a数组中的元素对10求余等于0的个数，保

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Java经典编程习题100例：第18例：编写程序，将一个数组中的元素倒排过来。例如原数组为1，2，3，4，5；则倒排后数组中的值

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Java经典编程习题100例：第16例：定义一个int型的一维数组，包含40个元素，用来存储每个学员的成绩，循环产生40个0~100之间的随机整数，将它们存储到一维数组中，然后统计成绩低于平均分的学

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Java经典编程习题100例：第15例：定义一个int型的一维数组，包含10个元素，分别赋值为1~10，然后将数组中的元素都向前移一个位置，即，a[0]=a[1],a[1]=a[2],…最后一个元

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Java经典编程习题100例：第14例：定义一个int型的一维数组，包含10个元素，分别赋一些随机整数，然后求出所有元素的最大值，最小值，平均值，和值，并输出出来

题目描述：定义一个int型的一维数组，包含10个元素，分别赋一些随机整数，然后求出所有元素的最大值，最小值，平均值，和值，并输出出来解题思路：遍历数组即可代码：import java.util.Random; public class Main { ...

Java的自定义编程元素在命名时有什么要求？

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