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Java StringBuffer append()用法及代码示例


先决条件：Java中的StringBuffer类
的java.lang.StringBuffer.append()方法用于将某些参数的字符串表示形式附加到序列中。可以使用13种方式/形式使用append()方法：

  1. StringBuffer append(布尔值a)：java.lang.StringBuffer.append(boolean a)是Java中的一种内置方法，用于将boolean参数的字符串表示形式附加到给定序列。

    用法:


    public StringBuffer append(boolean a)

    参数：此方法接受布尔类型的单个参数a，表示要附加的布尔值。

    返回值：该方法返回对此对象的引用。

    例子：

    Input: 
string_buffer = "I love my Country" 
boolean a = true

Output: I love my Country true

    以下示例程序旨在说明java.lang.StringBuffer.append()方法：

    // Java praogram to illustrate the 
// StringBuffer append(boolean a) 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuffer sbf1 = new StringBuffer("We are geeks and its really "); 
        System.out.println("Input: " + sbf1); 
  
        // Appending the boolean value 
        sbf1.append(true); 
        System.out.println("Output: " + sbf1); 
  
        System.out.println(); 
  
        StringBuffer sbf2 = new StringBuffer("We are lost - "); 
        System.out.println("Input: " + sbf2); 
  
        // Appending the boolean value 
        sbf2.append(false); 
        System.out.println("Output: " + sbf2); 
    } 
}
    输出： 
    Input: We are geeks and its really 
Output: We are geeks and its really true

Input: We are lost - 
Output: We are lost - false
  2. java.lang.StringBuffer.append(字符)：这是一个内置方法，将char参数的字符串表示形式附加到给定序列。 char参数附加到此StringBuffer序列的内容之后。

    用法:

    public StringBuffer append(char a)

    参数：该方法接受单个参数a，该参数是Char值，该值将附加字符串表示形式。

    返回值：执行附加操作后，该方法返回一个字符串对象。
    例子：

    Input :
StringBuffer = I love my Country 
char a = A

Output: I love my Country A

    以下示例程序旨在说明java.lang.StringBuffer.append(char a)方法。

    // Java praogram to illustrate the 
// java.lang.StringBuffer.append(char a) 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
        System.out.println("We are geeks and its really "); 
        StringBuffer sbf = new StringBuffer("We are geeks and its"); 
  
        /* Here it appends the char argument as 
         string to the string buffer */
        sbf.append('M'); 
        System.out.println("Result after appending = " + sbf); 
  
        System.out.println("We are lost -"); 
        sbf = new StringBuffer("We are lost -"); 
  
        /* Here it appends the char argument as 
         string to the string buffer */
        sbf.append('&'); 
        System.out.println("Result after appending = " + sbf); 
    } 
}
    输出： 
    We are geeks and its really 
Result after appending = We are geeks and itsM
We are lost -
Result after appending = We are lost -&
  3. StringBuffer append(char [] astr)：java.lang.StringBuffer.append(char [] astr)是一种内置方法，它将char数组参数的字符串表示形式附加到此StringBuffer序列中。

    用法:

    public StringBuffer append(char[] astr)

    参数：该方法接受单个参数astr，该参数是要附加字符串表示形式的Char序列。

    返回值：执行附加操作后，该方法返回一个字符串对象。
    例子：

    Input :
StringBuffer  = I love my Country   
char[] astr = 'I', 'N', 'D', 'I', 'A'

Output: I love my Country INDIA

    以下示例程序旨在说明java.lang.StringBuffer.append(char [] astr)方法：

    // Java praogram to illustrate the 
// java.lang.StringBuffer.append(<em>char[] astr</em>) 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        System.out.println("We are geeks and its really "); 
        StringBuffer sbf = new StringBuffer("We are geeks and its "); 
  
        // Char array 
        char[] astr = new char[] { 'G', 'E', 'E', 'k', 'S' }; 
  
        /* Here it appends string representation of char array  
        argument to this string buffer */
        sbf.append(astr); 
        System.out.println("Result after appending = " + sbf); 
  
        System.out.println("We are lost -"); 
        sbf = new StringBuffer("We are lost -"); 
  
        // Char array 
        astr = new char[] { 'a', 'b', 'c', 'd' }; 
  
        /* Here it appends string representation of char array argument to 
        argument to this string buffer */
        sbf.append(astr); 
        System.out.println("Result after appending = " + sbf); 
    } 
}
    输出： 
    We are geeks and its really 
Result after appending = We are geeks and its GEEkS
We are lost -
Result after appending = We are lost -abcd
  4. StringBuffer append(char [] cstr，int iset，int ilength)：此方法将char数组参数的子数组的字符串表示形式附加到此序列。从索引iset开始的char数组cstr的字符按顺序附加到此序列的内容中。该序列的长度增加ilength的值。

    用法:

    public StringBuffer append(char[] cstr, int iset, int ilenght)

    参数：此方法接受三个参数：

    • cstr –这是指字符序列。
    • iset–这是指要附加的第一个字符的索引。
    • ilenght –这是指要追加的字符数。

    返回值：执行附加操作后，该方法返回一个字符串对象。
    下面的程序演示了java.lang.StringBuffer.append(char [] cstr，int iset，int ilength)方法。

    // Java praogram to illustrate the 
// java.lang.StringBuffer append(char[] cstr, int iset, int ilength) 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuffer sb = new StringBuffer("Geeks"); 
        System.out.println(" String buffer  before = " + sb); 
  
        char[] cstr = new char[] { 'f', 'o', 'r', 'G', 'e', 'e', 'k', 's', 
                                   'b', 'e', 'a', 'g', 'e', 'e', 'k' }; 
  
        /* appends the string representation of char array argument to this 
      string buffer with offset initially at index 0 and length as 8 */
        sb.append(cstr, 0, 8); 
  
        // Print the string buffer after appending 
        System.out.println("After appending string buffer = " + sb); 
    } 
}
    输出： 
    String buffer  before = Geeks
After appending string buffer = GeeksforGeeks
  5. StringBuffer append(双倍)：此方法只是将double参数的字符串表示形式附加到此StringBuffer序列中。

    用法:


    public StringBuffer append(double a)

    参数：该方法接受单个参数a，该参数表示要附加字符串表示形式的十进制值。

    返回值：执行附加操作后，该方法返回一个字符串对象。
    例子：

    Input :
StringBuffer = I love my Country
Double a = 54.82
Output: I love my Country 54.82

    以下示例程序旨在说明java.lang.StringBuffer.append()方法。

    // Java praogram to illustrate the 
// java.lang.StringBuffer.append() 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        System.out.println("We are geeks and its really "); 
        StringBuffer sbf = new StringBuffer("We are geeks and its "); 
        // char array 
        Double astr = new Double(636.47); 
  
        /*Here it appends string representation of Double argument to  
         this string buffer*/
        sbf.append(astr); 
        System.out.println("Result after appending = " + sbf); 
  
        System.out.println("We are lost -"); 
        sbf = new StringBuffer("We are lost -"); 
  
        astr = new Double(827.38); 
  
        /*Here it appends string representation of Double argument  
         to this string buffer*/
        sbf.append(astr); 
        System.out.println("Result after appending = " + sbf); 
    } 
}
    输出： 
    We are geeks and its really 
Result after appending = We are geeks and its 636.47
We are lost -
Result after appending = We are lost -827.38
  6. StringBuffer append(浮点数f)：此方法将float参数的字符串表示形式附加到此序列。

    用法:

    public StringBuffer append(float a)

    参数：该方法接受单个参数a，该参数是要附加字符串表示形式的float值。

    返回值：执行操作后，StringBuffer.append(float a)方法返回对字符串对象的引用。

    例子：

    Input : 
     StringBuffer  = I love my Country   
float a =  5.2
 
Output: I love my Country 5.2

    以下示例程序旨在说明java.lang.StringBuffer.append()方法。

    // Java praogram to illustrate the 
// java.lang.StringBuffer.append() 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        System.out.println("We are geeks and its really "); 
        StringBuffer sbf = new StringBuffer("We are geeks and its "); 
  
        Float astr = new Float(6.47); 
  
        /* Here it appends string representation of  Float argument 
         to this string buffer */
        sbf.append(astr); 
        System.out.println("Result after appending = " + sbf); 
  
        System.out.println("We are lost -"); 
        sbf = new StringBuffer("We are lost -"); 
  
        astr = new Float(27.38); 
  
        // Here it appends string representation of Float 
        // argument to this string buffer 
        sbf.append(astr); 
        System.out.println("Result after appending = " + sbf); 
    } 
}
    输出： 
    We are geeks and its really 
Result after appending = We are geeks and its 6.47
We are lost -
Result after appending = We are lost -27.38
  7. StringBuffer append(诠释我：)此方法只是将int参数的字符串表示形式附加到此StringBuffer序列中。
    用法: 
    public StringBuffer append(int a)

    参数：该方法接受单个参数a，它是int值。

    返回值：该方法返回对此对象的引用。

    例子：

    Input :
StringBuffer = I love my Country  
int a = 55

Output: I love my Country 55

    以下示例程序旨在说明java.lang.StringBuffer.append()方法。

    // Java praogram to illustrate the 
// java.lang.StringBuffer.append() 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        System.out.println("We are geeks and its really "); 
        StringBuffer sbf = new StringBuffer("We are geeks and its "); 
  
        Integer astr = new Integer(827); 
  
        /*Here it appends string representation of  Integer argument to 
        argument to this string buffer*/
        sbf.append(astr); 
        System.out.println("Result after appending = " + sbf); 
  
        System.out.println("We are lost -"); 
        sbf = new StringBuffer("We are lost -"); 
  
        astr = new Integer(515); 
  
        // Here it appends string representation of Integer 
        // argument to this string buffer 
        sbf.append(astr); 
        System.out.println("Result after appending = " + sbf); 
    } 
}
    输出： 
    We are geeks and its really 
Result after appending = We are geeks and its 827
We are lost -
Result after appending = We are lost -515
  8. StringBuffer append(长l)：此方法只是将long参数的字符串表示形式附加到此StringBuffer序列。

    用法:

    public StringBuffer append(Long a)

    参数：该方法接受单个参数a，该参数为long值。

    返回值：执行附加操作后，该方法返回一个字符串对象。
    例子：

    Input :
StringBuffer  = I love my Country
Long a = 591995

Output: I love my Country 591995

    以下示例程序旨在说明java.lang.StringBuffer.append()方法。


    // Java praogram to illustrate the 
// java.lang.StringBuffer.append() 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        System.out.println("We are geeks and its really "); 
        StringBuffer sbf = new StringBuffer("We are geeks and its "); 
  
        Long astr = new Long(827); 
  
        /* Here it appends string representation of  Long argument 
         to this string buffer*/
        sbf.append(astr); 
        System.out.println("Result after appending = " + sbf); 
  
        System.out.println("We are lost -"); 
        sbf = new StringBuffer("We are lost -"); 
  
        astr = new Long(515); 
  
        /* Here it appends string representation of Long argument 
          to this string buffer*/
        sbf.append(astr); 
        System.out.println("Result after appending = " + sbf); 
    } 
}
    输出： 
    We are geeks and its really 
Result after appending = We are geeks and its 827
We are lost -
Result after appending = We are lost -515
  9. StringBuffer append(字符序列a)：此方法用于将指定的CharSequence追加到此序列。

    用法:

    public StringBuffer append(CharSequence a)

    参数：该方法接受单个参数a，即CharSequence值。

    返回值：执行附加操作后，该方法返回一个字符串对象。

    例子：

    Input :
StringBuffer  = I love my Country   
CharSequence a =  abcd

Output : I love my Countryabcd

    以下示例程序旨在说明java.lang.StringBuffer.append()方法。

    // Java praogram to illustrate the 
// java.lang.StringBuffer.append() 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuffer sbf = new StringBuffer("Geeksfor"); 
        System.out.println(" string buffer = " + sbf); 
  
        CharSequence chSeq = "geeks"; 
  
        // Appends the CharSequence 
        sbf.append(chSeq); 
  
        // Print the string buffer after appending 
        System.out.println("After append = " + sbf); 
    } 
}
    输出： 
    string buffer = Geeksfor
After append = Geeksforgeeks
  10. StringBuffer append(CharSequence chseq，从int开始，从int结束)：此方法用于将指定CharSequence的子序列附加到此StringBuffer。

    用法:

    StringBuffer append(CharSequence chseq, int start, int end)

    参数：该方法接受三个参数：

    • chseq(CharSequence)：这是CharSequence值。
    • start(整数)：这是指要附加的子序列的起始索引。
    • end(整数)：这是指要附加的子序列的结束索引。

    返回值：执行附加操作后，该方法返回字符串。


    例子：

    Input :
StringBuffer = Geeksforgeeks
CharSequence chseq = abcd1234
int start = 2
int end = 7

Output :Geeksforgeekscd123

    以下示例程序旨在说明java.lang.StringBuffer.append()方法：

    // Java praogram to illustrate the 
// java.lang.StringBuffer.append() 
  
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuffer sbf = new StringBuffer("we are the "); 
        System.out.println(" string buffer = " + sbf); 
  
        CharSequence chSeq = "wegeekss"; 
  
        /* It appends the CharSequence with start index 2 and  
       end index 4 */
        sbf.append(chSeq, 2, 7); 
  
        System.out.println("After append string buffer = " + sbf); 
    } 
}
    输出： 
    string buffer = we are the 
After append string buffer = we are the geeks
  11. StringBuffer append(对象obj)：此方法用于将Object参数的字符串表示形式附加到StringBuffer。

    用法:

    StringBuffer append(Object obj)

    参数：该方法接受单个参数obj，它指向需要附加的对象。

    返回值：该方法在执行附加操作后返回字符串。

    以下示例程序旨在说明java.lang.StringBuffer.append()方法。

    程序：

    // Java praogram to illustrate the 
// java.lang.StringBuffer.append() 
  
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuffer sbf = new StringBuffer("Geeksfor"); 
        System.out.println("string buffer = " + sbf); 
  
        Object objectvalue = "geeks"; 
  
        // Here it appends the Object value 
        sbf.append(objectvalue); 
  
        System.out.println("After appending result is = " + sbf); 
    } 
}
    输出： 
    string buffer = Geeksfor
After appending result is = Geeksforgeeks
  12. StringBuffer append(字符串istr)：此方法用于将指定的字符串附加到此StringBuffer。
    用法: 
    StringBuffer append(String istr)

    参数：该方法接受String类型的单个参数istr，该参数表示要附加的值。

    返回值：该方法将指定的字符串返回到此字符序列。
    以下示例程序旨在说明java.lang.StringBuffer.append()方法。

    // Java praogram to illustrate the 
// java.lang.StringBuffer.append() 
  
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuffer sbf = new StringBuffer("Geeksfor"); 
        System.out.println("string buffer = " + sbf); 
  
        String strvalue = "geeks"; 
  
        // Here it appends the Object value 
        sbf.append(strvalue); 
  
        System.out.println("After appending result is = " + sbf); 
    } 
}
    输出： 
    string buffer = Geeksfor
After appending result is = Geeksforgeeks
  13. StringBuffer append(StringBuffer sbf)：此方法用于将指定的StringBuffer附加到此序列或StringBuffer。

    用法:

    public StringBuffer append(StringBuffer sbf)

    参数：该方法接受单个参数sbf，该参数表示要附加的StringBuffer。

    返回值：该方法将StringBuffer返回此序列。
    以下示例程序旨在说明java.lang.StringBuffer.append()方法。

    // Java praogram to illustrate the 
// java.lang.StringBuffer.append() 
  
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuffer sbf1 = new StringBuffer("Geeks"); 
        System.out.println("String buffer 1 = " + sbf1); 
  
        StringBuffer sbf2 = new StringBuffer("forgeeks "); 
        System.out.println("String buffer 2 = " + sbf2); 
  
        // Here it appends stringbuffer2 to stringbuffer1 
        sbf1.append(sbf2); 
  
        System.out.println("After appending the result is = " + sbf1); 
    } 
}
    输出： 
    String buffer 1 = Geeks
String buffer 2 = forgeeks 
After appending the result is = Geeksforgeeks


相关用法


注：本文由纯净天空筛选整理自ankita_chowrasia大神的英文原创作品 StringBuffer append() Method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。