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Java StringBuilder append()用法及代码示例


java.lang.StringBuilder.append()方法用于将某些参数的字符串表示形式附加到序列中。通过传递各种类型的参数，可以使用append()方法使用13种方式/形式：

  1. StringBuilder append(boolean a)：java.lang.StringBuilder.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 StringBuilder 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 = "We are Indians" 
boolean a = true

Output:We are Indians true

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

    // Java program to illustrate the 
// StringBuilder append(boolean a) 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuilder sb1 = new 
                      StringBuilder("Welcome to Geeksforgeeks "); 
        System.out.println("Input:" + sb1); 
  
        // Appending the boolean value 
        sb1.append(true); 
        System.out.println("Output:" + sb1); 
  
        System.out.println(); 
  
        StringBuilder sb2 = new StringBuilder("We fail- "); 
        System.out.println("Input:" + sb2); 
  
        // Appending the boolean value 
        sb2.append(false); 
        System.out.println("Output:" + sb2); 
    } 
}
    输出： 
    Input:Welcome to Geeksforgeeks 
Output:Welcome to Geeksforgeeks true

Input:We fail- 
Output:We fail- false
  2. java.lang.StringBuilder.append(字符)：这是Java中的一种内置方法，用于将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StringBuilder序列的内容之后。

    用法:

    public StringBuilder 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。
    Examples:

    Input:
StringBuilder = 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.StringBuilder.append(char a)方法。

    // Java program to illustrate the 
// java.lang.StringBuilder.append(char a) 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
          
        StringBuilder sbf = new 
                       StringBuilder("Welcome geeks!"); 
                System.out.println( sbf); 
  
        /* Here it appends the char argument as 
        string to the StringBuilder */
        sbf.append('T'); 
        System.out.println("Result after"+ 
                                 " appending = " + sbf); 
  
      
        sbf = new StringBuilder("hello world-"); 
                System.out.println(sbf); 
        /* Here it appends the char argument as 
        string to the String Builder */
        sbf.append('#'); 
        System.out.println("Result after appending = " 
                                                         + sbf); 
    } 
}
    输出： 
    Welcome geeks!
Result after appending = Welcome geeks!T
hello world-
Result after appending = hello world-#
  3. StringBuilder append(char [] astr)：java.lang.StringBuilder.append(char [] astr)是内置方法，它将char数组参数的字符串表示形式附加到此StringBuilder序列中。

    用法:

    public StringBuilder 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。
    Examples:

    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.StringBuilder.append(char [] astr)方法：

    // Java program to illustrate the 
// java.lang.StringBuilder.append(<em>char[] astr</em>) 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
          
        StringBuilder sbf = new 
                      StringBuilder("We are geeks  "); 
        System.out.println(sbf); 
  
        // Char array 
        char[] astr = new char[]  
                          { 'G', 'E', 'E', 'k', 'S' }; 
  
        /* Appends string representation of char 
                   array to this String Builder */
        sbf.append(astr); 
    System.out.println("Result after"+ 
                            " appending = " + sbf); 
          
        sbf = new StringBuilder("We are  -"); 
                System.out.println(sbf); 
  
        // Char array 
        astr = new char[] { 'a', 'b', 'c', 'd' }; 
  
        /* Appends string representation of char  
                   array to this StringBuilder */
        sbf.append(astr); 
        System.out.println("Result after appending = " + sbf); 
    } 
}
    输出： 
    We are geeks  
Result after appending = We are geeks  GEEkS
We are  -
Result after appending = We are  -abcd
  4. StringBuilder 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 StringBuilder 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char的索引。
    • ilenght -这是指要附加的字符数。

    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.StringBuilder.append(char [] cstr，int iset，int ilength)方法。

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

    用法:


    public StringBuilder append(double val)

    参数：该方法接受单个参数val，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。
    Examples:

    Input:
StringBuffer = my Country
Double a = 54.82

Output:my Country 54.82

    下面的程序演示了java.lang.StringBuilder.append(double val)方法。

    // Java program to illustrate the 
// java.lang.StringBuilder.append() 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        System.out.println("We are geeks and its really "); 
        StringBuilder sbf = new 
              StringBuilder("We are geeks and its "); 
  
        // Char array 
        Double astr = new Double(36.47); 
  
        /* Here it appends string representation of Double  
           argument to this StringBuilder*/
        sbf.append(astr); 
        System.out.println("Result after appending = " + sbf); 
  
        System.out.println("We are lost -"); 
        sbf = new StringBuilder("We are lost -"); 
  
        astr = new Double(27.38); 
  
        /* Here it appends string representation of Double   
           argument to this StringBuilder*/
        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 36.47
We are lost -
Result after appending = We are lost -27.38
  6. StringBuilder append(float val)：此方法将float参数的字符串表示形式附加到此序列。

    用法:

    public StringBuilder append(float val)

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

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

    例子：

    Input:
StringBuilder  = 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.StringBuilder.append()方法。

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

    参数：该方法接受单个参数val，该参数是一个整数值，应在该整数值上执行操作。

    返回值：该方法返回对此对象的引用。

    例子：

    Input:
StringBuilder = 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.StringBuilder.append()方法。

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

    用法:

    public StringBuilder append(Long val)

    参数：该方法接受单个参数val，它是long值。

    返回值：执行附加操作后，该方法返回一个字符串对象。
    Examples:

    Input:
StringBuilder  = 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.StringBuilder.append()方法。


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

    用法:

    public StringBuilder 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:
StringBuilder  = "I love my Country" 
CharSequence a = " India"

Output:I love my Country India

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

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

    用法:

    StringBuilder 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:
StringBuilder = Geeksforgeeks
CharSequence chseq = abcd1234
int start = 2
int end = 7

Output:Geeksforgeekscd123

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

    // Java program to illustrate the 
// java.lang.StringBuilder.append() 
  
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuilder sbf = new 
              StringBuilder("We are the "); 
        System.out.println("String builder= "
                                      + 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 builder= We are the 
After append string buffer = We are the geeks
  11. StringBuilder append(Object obj)：此方法用于将Object参数的字符串表示形式附加到StringBuilder。

    用法:

    StringBuilder 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.StringBuilder.append()方法。

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

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

    用法:

    public StringBuilder append(StringBuilder sbf)

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

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

    // Java program to illustrate the 
// java.lang.StringBuilder.append() 
  
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuilder sbf1 = new StringBuilder("Geeks"); 
        System.out.println("String Builder 1 = " + sbf1); 
  
        StringBuilder sbf2 = new StringBuilder("forgeeks "); 
        System.out.println("String Builder 2 = " + sbf2); 
  
        // Here it appends String Builder2 to String Builder1 
        sbf1.append(sbf2); 
  
        System.out.println("After appending the result is = "+sbf1); 
    } 
}
    输出： 
    String Builder 1 = Geeks
String Builder 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 StringBuilder 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。