流读取导致StringBuilder.toString()乱码的问题及解决
Andrew_Yuan 人气:0流读取导致StringBuilder.toString()乱码
乱码问题
StringBuilder sb = new StringBuilder(); String s = new String(sb.toString().getBytes("ios8859-1"),"UTF-8");
顺便回忆一下String, StringBuilder, StringBuffer直接的区别:
String对象每次追加字符串的时候都是创建了新的对象,消耗时间最长,性能最低,操作少量数据的时候可以用它;
StringBuilder和StringBuffer每次追加的都是同一个对象,消耗的时间短,性能优良;
StringBuilder比StringBuffer更快一点,因为StringBuffer是线程安全的,支持同步锁,而StringBuilder是线程不安全的,所以在单线程的时候最好使用StringBuilder,多线程的时候则使用线程安全的StringBuffer。
Java StringBuilder toString()方法与示例
StringBuilder类的toString()方法 (StringBuilder Class toString() method)
toString() method is available in java.lang package.
toString()方法在java.lang包中可用。
toString() method is used to represent string denoted by this object (when we create a new string object so first it is created and instantiated to contain the data[set of characters] denoted by this object currently).
toString()方法用于表示此对象表示的字符串(当我们创建一个新的字符串对象时,首先创建并实例化它包含当前由该对象表示的data [字符集])。
toString() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
toString()方法是一种非静态方法,只能通过类对象访问,如果尝试使用类名称访问该方法,则会收到错误消息。
toString() method does not throw an exception at the time of string representation.
toString()方法在字符串表示时不会引发异常。
Syntax:
句法:
public String toString();
Parameter(s):
参数:
- It does not accept any parameter.
- 它不接受任何参数。
Return value:
返回值:
- The return type of this method is String, it returns the string denotation of this set of characters represented by this object.
- 此方法的返回类型为String ,它返回此对象表示的这组字符的字符串表示形式。
Example:
例:
// Java program to demonstrate the example // of String toString() method of StringBuilder public class ToString { public static void main(String[] args) { // Creating an StringBuilder object StringBuilder st_b = new StringBuilder("Java "); // By using append() method is to append the given string to // st_b object st_b.append("World"); // By using toString() method is to represent st_b // object to String System.out.println("st_b.toString() = " + st_b.toString()); } }
Output
输出量
st_b.toString() = Java World
以上为个人经验,希望能给大家一个参考,也希望大家多多支持。
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