Java中的StringBuffer insert（）-yiteyi-C++库

字符串缓冲区。方法将给定数据类型的字符串表示形式插入到字符串缓冲区 .

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语法：

 str.insert(int position,  char x);
 str.insert(int position,  boolean x);
 str.insert(int position,  char[] x);
 str.insert(int position, float x);
 str.insert(int position, double x);
 str.insert(int position, long x);
 str.insert(int position, int x);

position is the index in string where
we need to insert.

返回：

This method returns a reference to this object.

例外情况：

The position argument must be greater
than or equal to 0, and less than 
or equal to the length of this string.

布尔输入

                     // Java program to demonstrate StringBuffer insert                   
                     // for boolean input.                   
                     import                               java.lang.*;                   
                             
                     public                               class                               GFG {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         StringBuffer str =                   
                                         new                               StringBuffer(                               "geeks for geeks"                               );                   
                                         System.out.println(                               "string = "                               + str);                   
                             
                                         // insert boolean value at offset 8                   
                                         str.insert(                               8                               ,                               true                               );                   
                             
                                         // prints stringbuffer after insertion                   
                                         System.out.print(                               "After insertion = "                               );                   
                                         System.out.println(str.toString());                   
                                         }                   
                     }                   

输出：

string = geeks for geeks
After insertion = geeks fotruer geeks

字符输入

                     // Java program to demonstrate StringBuffer insert                   
                     // for char input.                   
                     import                               java.lang.*;                   
                             
                     public                               class                               GFG {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         StringBuffer str =                   
                                         new                               StringBuffer(                               "geeks for geeks"                               );                   
                                         System.out.println(                               "string = "                               + str);                   
                             
                                         // insert boolean value at offset 8                   
                                         str.insert(                               8                               ,                               'p'                               );                   
                             
                                         // prints stringbuffer after insertion                   
                                         System.out.print(                               "After insertion = "                               );                   
                                         System.out.println(str.toString());                   
                                         }                   
                     }                   

输出：

string = geeks for geeks
After insertion = geeks fopr geeks

字符数组输入

                     // Java program to demonstrate StringBuffer insert                   
                     // for char array input.                   
                     import                               java.lang.*;                   
                             
                     public                               class                               GFG {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         StringBuffer str =                   
                                         new                               StringBuffer(                               "geeks for geeks"                               );                   
                                         System.out.println(                               "string = "                               + str);                   
                             
                                         // character array to be inserted                   
                                         char                               cArr[] = {                               'p'                               ,                               'a'                               ,                               'w'                               ,                               'a'                               ,                               'n'                               };                   
                             
                                         // insert character array at offset 9                   
                                         str.insert(                               8                               , cArr);                   
                             
                                         // prints stringbuffer after insertion                   
                                         System.out.print(                               "After insertion = "                               );                   
                                         System.out.println(str.toString());                   
                                         }                   
                     }                   

输出：

string = geeks for geeks
After insertion = geeks fopawanr geeks

浮点输入

                     // Java program to demonstrate StringBuffer insert                   
                     // for float input.                   
                     import                               java.lang.*;                   
                             
                     public                               class                               GFG                   
                     {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         StringBuffer str =                   
                                         new                               StringBuffer(                               "geeks for geeks"                               );                   
                                         System.out.println(                               "string = "                               + str);                   
                             
                                         // insert float value at offset 3                   
                                         str.insert(                               8                               ,                               41                               .35f);                   
                             
                                         // prints stringbuffer after insertion                   
                                         System.out.print(                               "After insertion = "                               );                   
                                         System.out.println(str.toString());                   
                                         }                   
                     }                   

输出：

string = geeks for geeks
After insertion = geeks fo41.35r geeks

双输入

                     // Java program to demonstrate StringBuffer insert                   
                     // for double input.                   
                     import                               java.lang.*;                   
                             
                     public                               class                               GFG                   
                     {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         StringBuffer str =                   
                                         new                               StringBuffer(                               "geeks for geeks"                               );                   
                                         System.out.println(                               "string = "                               + str);                   
                             
                                         // insert float value at offset 3                   
                                         str.insert(                               8                               ,                               41                               .35d);                   
                             
                                         // prints stringbuffer after insertion                   
                                         System.out.print(                               "After insertion = "                               );                   
                                         System.out.println(str.toString());                   
                                         }                   
                     }                   

输出：

string = geeks for geeks
After insertion = geeks fo41.35r geeks

长输入

                     // Java program to demonstrate StringBuffer insert                   
                     // for Long input.                   
                     import                               java.lang.*;                   
                             
                     public                               class                               GFG                   
                     {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         StringBuffer str =                               new                               StringBuffer(                               "geeks for geeks"                               );                   
                                         System.out.println(                               "string = "                               + str);                   
                             
                                         // insert float value at offset 3                   
                                         str.insert(                               8                               , 546986L);                   
                             
                                         // prints stringbuffer after insertion                   
                                         System.out.print(                               "After insertion = "                               );                   
                                         System.out.println(str.toString());                   
                                         }                   
                     }                   

输出：

string = geeks for geeks
After insertion = geeks fo546986r geeks

整数输入

                     // Java program to demonstrate StringBuffer insert                   
                     // for Int input.                   
                     import                               java.lang.*;                   
                             
                     public                               class                               GFG                   
                     {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         StringBuffer str =                   
                                         new                               StringBuffer(                               "geeks for geeks"                               );                   
                                         System.out.println(                               "string = "                               + str);                   
                             
                                         // insert float value at offset 8                   
                                         int                               x =                               10                               ;                   
                                         str.insert(                               8                               , x);                   
                             
                                         // prints stringbuffer after insertion                   
                                         System.out.print(                               "After insertion = "                               );                   
                                         System.out.println(str.toString());                   
                                         }                   
                     }                   

输出：

string = geeks for geeks
After insertion = geeks fo10r geeks

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