Java StringBuffer insert()

StringBuffer.insert()方法在StringBuffer中的指定位置插入指定数据类型的字符串表示。

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是我们需要插入的字符串中的索引。中的索引，我们需要插入。

返回 。

该方法返回该对象的一个引用。

异常 。

position参数必须大于 大于或等于0，并且小于 或等于这个字符串的长度。

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 geeksAfter 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 geeksAfter insertion = geeks fopr geeks

字符阵列输入

// 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 geeksAfter insertion = geeks fopawanr geeks

浮动输入

// 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 geeksAfter insertion = geeks fo41.35r geeks

双重输入

// 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 geeksAfter 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 geeksAfter insertion = geeks fo546986r geeks

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 geeksAfter insertion = geeks fo10r geeks