Java StringWriter 類根據字符串緩衝區流的字符創建字符串。 Java 中StringWriter 類的方法也可以在關閉 Stream 後調用,因為這不會引發 IO 異常。
Java StringWriter 類中的聲明
public class StringWriter extends Writer
Java 中StringWriter 類中的構造函數
Java中String Writer類中使用的構造函數如下:
- StringWriter():使用字符串緩衝區的初始或默認大小創建新的StringWriter
- StringWriter(int 大小):使用提到的字符串緩衝區大小創建一個新的StringWriter
Java StringWriter 類中的方法
下麵提到了 Java StringWriter 類涉及的所有方法:
Method |
Description |
---|---|
append(char Sw) | 將單個字符追加到字符串緩衝區。 |
追加(CharSequence char_sq) | 將指定的字符序列附加到字符串緩衝區。 |
追加(CharSequence,char_sq,int開始,int結束) | 將字符序列的指定部分追加到字符串緩衝區。 |
flush() | 刷新StringWriter流。 |
getBuffer() | 返回 StringWriter 的StringBuffer。 |
write(int char) | 將單個字符寫入字符串緩衝區。 |
write(String str) | 將字符串寫入字符串緩衝區。 |
write(String str, int offset, int maxlen) | 將字符串的某些部分寫入字符串緩衝區。 |
write(char[] carray, int 偏移量, int maxlen) | 將字符數組的某些部分寫入字符串緩衝區。 |
toString() | 以字符串形式返回字符串緩衝區的值 |
close() | closes String Buffer。由於該方法還可以在關閉String Buffer之後調用,所以它不起作用。 |
1. 寫(int char)
java.io.StringWriter.write(int char) 將單個字符寫入字符串緩衝區。
Syntax: public void write(int char) Parameters : char : int value of the character to be written. Return : void
2. 寫入(字符串str)
java.io.StringWriter.write(String str)將字符串寫入字符串緩衝區。
Syntax: public void write(String str) Parameters : str : string to be written to the String Buffer. Return : void
3. 寫入(字符串str,int偏移量,int maxlen)
java.io.StringWriter.write(String str, int offset, int maxlen)將字符串的某些部分寫入字符串緩衝區。
Syntax: public void write(String str, int offset, int maxlen) Parameters : str : string to be written to the String Buffer. offset : start position of the String maxlen : maximum length upto which string has to written Return : void
4. write(char[] carray, int 偏移量, int maxlen)
java.io.StringWriter.write(char[] carray, int 偏移量, int maxlen)將字符數組的某些部分寫入字符串緩衝區。
Syntax: public void write(char[] carray, int offset, int maxlen) Parameters : carray : character to be written to the String Buffer offset : start position of the character array maxlen : maximum no. of the character of the carray has to written Return : void
5.toString()
java.io.StringWriter.toString() 以字符串形式返回字符串緩衝區的值。
Syntax: public String toString() Parameters : ----------- Return : string value of the String Buffer
6.close()
java.io.StringWriter.close() 關閉字符串緩衝區。由於該方法也可以在關閉字符串緩衝區後調用,因此它不起作用。
Syntax: public void close() Parameters : ----------- Return : void
7. 追加(char Sw)
java.io.StringWriter.append(char Sw) 將單個字符追加到字符串緩衝區。
Syntax: public StringWriter append(char Sw) Parameters : Sw : character to be append Return : StringWriter
8. 追加(CharSequence char_sq)
java.io.StringWriter.append(CharSequence char_sq) 將指定的字符序列附加到字符串緩衝區。
Syntax: public StringWriter append(CharSequence char_sq) Parameters : char_sq : Character sequence to append. Return : StringWriter, if char sequence is null, then NULL appends to the StringWriter.
9. 追加(CharSequence char_sq, int開始,int結束)
java.io.StringWriter.append(CharSequence char_sq, int start, int end) 將字符序列的指定部分追加到字符串緩衝區。
Syntax: public StringWriter append(CharSequence char_sq, int start, int end) Parameters : char_sq : Character sequence to append. start : start of character in the Char Sequence end : end of character in the Char Sequence Return : void
10.flush()
java.io.StringWriter.flush() 刷新StringWriter 流。
Syntax: public void flush() Parameters : ----- Return : void
11.getBuffer()
java.io.StringWriter.getBuffer()返回StringWriter的字符串緩衝區。
Syntax: public StringBuffer getBuffer() Parameters : ----------- Return : String Buffer with its current value.
示例
Java 程序說明了 StringWriter 類方法的使用:
Java
// Java program illustrating the working of StringWriter
// class methods write(int char), write(String str), close()
// write(String str, int offset, int maxlen), toString()
// write(char[] carray, int offset, int maxlen)
import java.io.*;
public class NewClass {
public static void main(String[] args)
throws IOException
{
// Initializing String Writer
StringWriter geek_writer1 = new StringWriter();
StringWriter geek_writer2 = new StringWriter();
StringWriter geek_writer3 = new StringWriter();
StringWriter geek_writer4 = new StringWriter();
// Use of write(int char) : to write a character
geek_writer1.write(71);
geek_writer1.write(70);
geek_writer1.write(71);
// Use of toString() : Value written by write(int
// char)
System.out.println("Using write(int char) : "
+ geek_writer1.toString());
String str = "Hello Geeks";
// Use of write(String str) : to write string
geek_writer2.write(str);
// Value written by write(String str)
System.out.println("Using write(String str) : "
+ geek_writer2.toString());
// Use of write(String str, int offset, int maxlen)
// : to write part of string
geek_writer3.write(str, 2, 4);
geek_writer3.write(str, 5, 6);
// Value written by write(String str, int offset,
// int maxlen)
System.out.println(
"Using write(str, offset, maxlen) : "
+ geek_writer3.toString());
try {
// Use of Close() method : to close the
// geek_writer4 But no use as String Writer
// method is still working with it
geek_writer4.close();
}
catch (IOException except) {
System.out.println("ERROR");
except.printStackTrace();
;
}
// Initializing character array
char[] carray = str.toCharArray();
// Use of write(char[] carray, int offset, int
// maxlen): to write part of char array
geek_writer4.write(carray, 4, 6);
// Value written by write(String str, int offset,
// int maxlen)
System.out.println(
"Using write(carray, offset, maxlen) : "
+ geek_writer4.toString());
}
}
輸出
Using write(int char) : GFG Using write(String str) : Hello Geeks Using write(str, offset, maxlen) : llo Geeks Using write(carray, offset, maxlen) : o Geek
說明 StringWriter 類方法的使用的 Java 程序:append(CharSequence char_sq)、append(char Sw)、append(CharSequence char_sq、int start、int end)、flush()、getgetBuffer()
Java
// Java program illustrating the working of StringWriter
// class methods append(CharSequence char_sq), append(char
// Sw) append(CharSequence char_sq, int start,int end)
// flush(), getgetBuffer()
import java.io.*;
public class NewClass {
public static void main(String[] args)
throws IOException
{
// Initializing String Writer
StringWriter geek_writer1 = new StringWriter();
StringWriter geek_writer2 = new StringWriter();
StringWriter geek_writer3 = new StringWriter();
// Use of write(int char) : to write a character
geek_writer1.write(71);
geek_writer1.write(70);
geek_writer1.write(71);
// Use of toString() : Value written by write(int
// char)
System.out.println("Using write(int char) : "
+ geek_writer1.toString());
// Using flush() method
geek_writer1.flush();
System.out.println("Using flush() : "
+ geek_writer1.toString());
// Use of append(char Sw)
System.out.println("append(char Sw) : "
+ geek_writer1.append(" 1GFG1"));
// Use of getBuffer() :
System.out.println("Using geek_writer1 : "
+ geek_writer1.getBuffer());
// Initializing Character Sequence
CharSequence char_sq1 = "1 Hello 1";
CharSequence char_sq2 = " : 2 Geeks 2";
// Use of append(CharSequence char_sq)
geek_writer2.append(char_sq1);
geek_writer2.append(char_sq2);
System.out.println("append(char_sq) : "
+ geek_writer2.toString());
// Use of append(CharSequence char_sq,int start,int
// end)
geek_writer3.append(char_sq1, 0, 3);
geek_writer3.append(char_sq2, 3, 6);
System.out.println("append(char_sq,start,end) : "
+ geek_writer3.toString());
}
}
輸出
Using write(int char) : GFG Using flush() : GFG append(char Sw) : GFG 1GFG1 Using geek_writer1 : GFG 1GFG1 append(char_sq) : 1 Hello 1 : 2 Geeks 2 append(char_sq,start,end) : 1 H2 G
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注:本文由純淨天空篩選整理自佚名大神的英文原創作品 Java.io.StringWriter class in Java。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。