不使用trim方法从字符串中删除空格？ [英] Remove white space from string without using trim method?

问题描述

给定字符串为
' _ home sweet home __ '
如果用户输入模式为0则o / p应为'home如果用户输入模式为1，那么o / home应该为' _home sweet home'$ b $，$ home $ <$> $ b
b如果用户输入模式为2，则o / p应为'home sweet home'。

given string is '_home sweet home__' if user enter the mode as 0 then o/p should be 'home sweet home__' if user enter the mode as 1 then o/p should be '_home sweet home' if user enter the mode as 2 then o/p should be 'home sweet home'.

代码

Code

public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
System.out.println("Enter the String");
String str=sc.nextLine();
System.out.println("Enter the StringMode");
String strMode= sc.nextLine();
switch()
{

}

我想找到给定字符串中的空格总数。

i want to find total number of white spaces in the given string.

推荐答案

试试这个

StringTokenizer t = new StringTokenizer(str," ");
result = t.nextToken();
Boolean first = str.toCharArray()[0]==' ';
Boolean last = str.toCharArray()[str.length()-1]==' ';
while(t.hasMoreTokens())
{
    result += " " + t.nextToken();
}

switch(strMode)
{
    case 0 : if(last) result += " ";
             break;
    case 1 : if(first) result = " " + result;
             break;
}
System.out.println(result);

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