在java doc里有 String[] java.lang.String.split(String regex) Splits this string around matches of the given regular expression. This method works as if by invoking the two-argument split method with the given expression and a limit argument of zero. Tra
package folder; import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.util.HashMap;import java.util.Iterator;import java.util.Map; public class f
java List.add操作可以指定位置,addAll也可以指定: 使用: public class Test02 { public static void main(String[] args) { ArrayList<String> list = new ArrayList<>(); list.add("str1"); list.add("str2"); list.add(1,"str222"); for (int
//编写函数,将一个数的指定位置置0或置1 #include <stdio.h> unsigned int set_bit(unsigned int num, int pos, int flag) { int n = 1; n = n << (pos - 1); //将n的第pos位置1,其它全为0 if (flag == 0) { num = num&(~n); } else if (flag == 1) { num = num | n; } else printf(&q