这个课程的参考视频和图片来自youtube。
主要学到的知识点有：(the same use in C/C++)
1. x++, x += 1; similar x--, x -= 1; x *= 2; x /= 2.
- x++ : Plus 1 after the line is executed. similar x--
x = 2; System.out.printf(" x is now : %d", x++);
System.out.printf(" x is : %d", x);
The result of above, is
x is now : 2
x is : 3
- x += 1 equals x = x + 1; similar x -= 1; x *= 2; x /= 2.
2. For loop
- for (int i = 0; i < max; i ++){} will go through 0 unitl max -1, but intotal is max.
- for (int i = 1; i <= max; i ++){} will go through 1 unitl max, but intotal is max.
- Similar for (int i = max; i > 0; i --){} will go through max unitl 1, but intotal is max.
- for (int each : numArray) {} will go through each element/object in the array/collections.
int[] numArray = new int[] { 3, 4, 5, 8}; for (int each: numArray){
System.out.printf("%d "); }
the results of above will be like
3 4 5 8