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有很多种方式,这里推荐一
一、使用 StringBuilder 进行字符串处理,效率最高
public static void main(String[] args) { String str = "aaaaabbbbcccc";
StringBuilder sb = new StringBuilder(str); sb.insert(4,"123");
System.out.println(sb.toString()); }
输出: aaaa123abbbbcccc
效率比较高,整个过程只会产生2个对象
二、直接对字符串进行处理
public static void main(String[] args) { String str = "aaaaabbbbcccc"; String
substring = str.substring(0,4); String substring1 =
str.substring(4,str.length()); String substring2 = substring+"123"+substring1;
System.out.println(substring2); }
此方法效率比较低,整个过程会产生4个对象
三、直接对字符串进行处理
将字符串转成数组,然后对数组进行处理,不推荐,这里就不展示了,有兴趣的可以试试