1 标志符 命名注意事项: 不能以数字开头,可以用字母,$,_ 开头
A. 2variable //错误;
B. variable2
C. what$
D. _3_
2 float a = 20;
float b = 2f;
float c = 1.34f;
//float d = 1.0; //损失精度
System.out.println(a); //20.0
System.out.println(b); //2.0
System.out.println(c); //1.34
//System.out.print(d);
3 A. int arr[] = new int[3]; //对;
B. int arr[] = new int[3]{1,2,3}; //错; int arr[] = new int[]{1,2,3};
C. int [][]x = new int[][]; //错; int[][] arr = new int[3][2];
D. int[][] x = new int[2][]; //对;作者: 地狱里的帅灵魂 时间: 2015-8-2 23:23
不知道技术贴能不能重复 啊