java 空格

1 可以去掉多个空格

Stiring str ="              ";

String test[] = str.split("\\s+");
   System.out.println(test.length);
   System.out.println("".equals(test[0]));
   test[1]="33";
   for (String string : test) {
    System.out.println(string);
   }

2 String .split

String  str ="";

String test[] = str.split("");

test .length =  1

 

3 String .split

String  str ="           ";

String test[] = str.split("");

test .length = 0

4 String .split

String  str =" 33";

String test[] = str.split("");

test .length =2

5 String .split

String  str =" 33       ";

String test[] = str.split("");

test .length =2