public static void main(String[] args) { String s="itcast"; //字符串替换操作 System.out.println("将it替换成cn.it的结果:"+s.replace("it","cn.it")); //去除字符串空格操作 String s1=" i t c a s t "; System.out.println("去除字符串中两端的空格后的结果:"+s1.trim()); System.out.println("去除字符串所空格的结果:"+s1.replace(" ","")); } }