结果如图
package com.softeasy.test1;
public class String_trim {
public static void main(String[] args) {
String str = " slkjfsj sdfjf jsjs ";
System.out.println("没有用trim()方法前str为：|" + str + "|");
str = str.trim();
System.out.println("用了trim()方法后str为：|" + str + "|");
}
}