什么是电子商务网站建设公益事业做网站

什么是电子商务网站建设,公益事业做网站,网站创建费用,wordpress设置插件下载Java StringBuffer 和 StringBuilder 类当对字符串进行修改的时候#xff0c;需要使用 StringBuffer 和 StringBuilder 类。和 String 类不同的是#xff0c;StringBuffer 和 StringBuilder 类的对象能够被多次的修改#xff0c;并且不产生新的未使用对象。在使用 StringBuf…Java StringBuffer 和 StringBuilder 类当对字符串进行修改的时候需要使用 StringBuffer 和 StringBuilder 类。和 String 类不同的是StringBuffer 和 StringBuilder 类的对象能够被多次的修改并且不产生新的未使用对象。在使用 StringBuffer 类时每次都会对 StringBuffer 对象本身进行操作而不是生成新的对象所以如果需要对字符串进行修改推荐使用 StringBuffer。StringBuilder 类在 Java 5 中被提出它和 StringBuffer 之间的最大不同在于 StringBuilder 的方法不是线程安全的不能同步访问。由于 StringBuilder 相较于 StringBuffer 有速度优势所以多数情况下建议使用 StringBuilder 类。实例public class RunoobTest{ public static void main(String[] args){ StringBuilder sb new StringBuilder(10); sb.append(Runoob..); System.out.println(sb); sb.append(!); System.out.println(sb); sb.insert(8, Java); System.out.println(sb); sb.delete(5,8); System.out.println(sb); } }以上实例编译运行结果如下Runoob.. Runoob..! Runoob..Java! RunooJava!然而在应用程序要求线程安全的情况下则必须使用 StringBuffer 类。Test.java 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class Test{ public static void main(String[] args){ StringBuffer sBuffer new StringBuffer(菜鸟教程官网); sBuffer.append(www); sBuffer.append(.runoob); sBuffer.append(.com); System.out.println(sBuffer); } }