1. String 转 int
1 String str= "111";
2
3
4 //1.
5 Integer.parseInt(str);
6
7 //2.
8
2. String 转 Long
1 String str = "11111111111111"
2
3 //1.
4 Long.parseLong(str)
5
6 //2.
7
3.int 转 String
1 int i = 111;
2
3 //1.
4 String str = "" + i;
5
6 //2.
7
4.long 转 int
1 long i = 11111;
2
3 //1.
4 int ii = (int)i;
5
6 //2.
7 int ii= new
5. 左移 、右移
1 int i = 111;
2
3 //左移2位
4 i << 2;
5
6 //右移移2位
7
6.取模
1 int i = 111;
2
3 //取模
4 int
