Java StringBuilderinsert Examples
In this tutorial, we will learn about the Java StringBuilder.insert() function, and learn how to use this function to insert a value/object in StringBuilder sequence, with the help of examples.
insertint offset, boolean b
StringBuilder.insert() inserts the string representation of the boolean argument into this StringBuilder sequence.
Syntax
The syntax of insert() function is
insert(int offset, boolean b)
where
| Parameter | Description |
|---|---|
| offset | The index at which insert operation happens in StringBuilder sequence. |
| b | This boolean value will be inserted at given offset. |
Returns
The function returns reference to this StringBuilder object.
Example 1 insertoffset, b
In this example, we will initialize a StringBuilder, and insert a boolean true value at offset 5.
Java Program
public class Example {
public static void main(String[] args) {
StringBuilder stringBuilder = new StringBuilder("abcdefghijk");
System.out.println("Before insert : " + stringBuilder.toString());
int offset = 5;
boolean b = true;
stringBuilder.insert(offset, b);
System.out.println("After insert : " + stringBuilder.toString());
}
}
Output
Before insert : abcdefghijk After insert : abcdetruefghijk
insertint offset, char c
StringBuilder.insert() inserts the string representation of the char argument into this StringBuilder sequence.
Syntax
The syntax of insert() function is
insert(int offset, char c)
where
| Parameter | Description |
|---|---|
| offset | The index at which insert operation happens in StringBuilder sequence. |
| c | This char value will be inserted at given offset. |
Returns
The function returns reference to this StringBuilder object.
Example 2 insertoffset, c
In this example, we will initialize a StringBuilder, and insert a char 'M' value at offset 5.
Java Program
public class Example {
public static void main(String[] args) {
StringBuilder stringBuilder = new StringBuilder("abcdefghijk");
System.out.println("Before insert : " + stringBuilder.toString());
int offset = 5;
char c = 'M';
stringBuilder.insert(offset, c);
System.out.println("After insert : " + stringBuilder.toString());
}
}
Output
Before insert : abcdefghijk After insert : abcdeMfghijk
insertint offset, char str
StringBuilder.insert() inserts the string representation of the char array argument into this StringBuilder sequence.
Syntax
The syntax of insert() function is
insert(int offset, char[] str)
where
| Parameter | Description |
|---|---|
| offset | The index at which insert operation happens in StringBuilder sequence. |
| str | This char array will be inserted at given offset. |
Returns
The function returns reference to this StringBuilder object.
Example 3 insertoffset, str
In this example, we will initialize a StringBuilder, and insert a char array str at offset 5.
Java Program
public class Example {
public static void main(String[] args) {
StringBuilder stringBuilder = new StringBuilder("abcdefghijk");
System.out.println("Before insert : " + stringBuilder.toString());
int offset = 5;
char[] str = {'X', 'Y', 'Z'};
stringBuilder.insert(offset, str);
System.out.println("After insert : " + stringBuilder.toString());
}
}
Output
Before insert : abcdefghijk After insert : abcdeXYZfghijk
insertint index, char str, int offset, int len
StringBuilder.insert() inserts the string representation of a subarray of the str array argument into this StringBuilder sequence.
Syntax
The syntax of insert() function is
insert(int index, char[] str, int offset, int len)
where
| Parameter | Description |
|---|---|
| index | The position at which insert operation happens in StringBuilder sequence. |
| str | This char array value will be inserted at given index. |
| offset | Offset of subarray in str. |
| len | Length of subarray in str. |
Returns
The function returns reference to this StringBuilder object.
Example 4 insertindex,str, offset, len
In this example, we will initialize a StringBuilder, and insert a boolean true value at offset 5.
Java Program
public class Example {
public static void main(String[] args) {
StringBuilder stringBuilder = new StringBuilder("abcdefghijk");
System.out.println("Before insert : " + stringBuilder.toString());
int index = 5;
int offset = 2;
int len = 5;
char[] str = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J'};
stringBuilder.insert(index, str, offset, len);
System.out.println("After insert : " + stringBuilder.toString());
}
}
Output
Before insert : abcdefghijk After insert : abcdeCDEFGfghijk
insertint offset, double d
StringBuilder.insert() inserts the string representation of the double argument into this StringBuilder sequence.
Syntax
The syntax of insert() function is
insert(int offset, double d)
where
| Parameter | Description |
|---|---|
| offset | The index at which insert operation happens in StringBuilder sequence. |
| d | This double value will be inserted at given offset. |
Returns
The function returns reference to this StringBuilder object.
Example 5 insertoffset, d
In this example, we will initialize a StringBuilder, and insert a double value at offset 5.
Java Program
public class Example {
public static void main(String[] args) {
StringBuilder stringBuilder = new StringBuilder("abcdefghijk");
System.out.println("Before insert : " + stringBuilder.toString());
int offset = 5;
double d = 3.14526985;
stringBuilder.insert(offset, d);
System.out.println("After insert : " + stringBuilder.toString());
}
}
Output
Before insert : abcdefghijk After insert : abcde3.14526985fghijk
insertint offset, float f
StringBuilder.insert() inserts the string representation of the float argument into this StringBuilder sequence.
Syntax
The syntax of insert() function is
insert(int offset, float f)
where
| Parameter | Description |
|---|---|
| offset | The index at which insert operation happens in StringBuilder sequence. |
| f | This float value will be inserted at given offset. |
Returns
The function returns reference to this StringBuilder object.
Example 6 insertoffset, f
In this example, we will initialize a StringBuilder, and insert a float value at offset 5.
Java Program
public class Example {
public static void main(String[] args) {
StringBuilder stringBuilder = new StringBuilder("abcdefghijk");
System.out.println("Before insert : " + stringBuilder.toString());
int offset = 5;
float f = 3.14f;
stringBuilder.insert(offset, f);
System.out.println("After insert : " + stringBuilder.toString());
}
}
Output
Before insert : abcdefghijk After insert : abcde3.14fghijk
insertint offset, int i
StringBuilder.insert() inserts the string representation of the second int argument into this StringBuilder sequence.
Syntax
The syntax of insert() function is
insert(int offset, int i)
where
| Parameter | Description |
|---|---|
| offset | The index at which insert operation happens in StringBuilder sequence. |
| i | This integer value will be inserted at given offset. |
Returns
The function returns reference to this StringBuilder object.
Example 7 insertoffset, i
In this example, we will initialize a StringBuilder, and insert a integer value at offset 5.
Java Program
public class Example {
public static void main(String[] args) {
StringBuilder stringBuilder = new StringBuilder("abcdefghijk");
System.out.println("Before insert : " + stringBuilder.toString());
int offset = 5;
int i = 44;
stringBuilder.insert(offset, i);
System.out.println("After insert : " + stringBuilder.toString());
}
}
Output
Before insert : abcdefghijk After insert : abcde44fghijk
insertint offset, long l
StringBuilder.insert() inserts the string representation of the long argument into this StringBuilder sequence.
Syntax
The syntax of insert() function is
insert(int offset, long l)
where
| Parameter | Description |
|---|---|
| offset | The index at which insert operation happens in StringBuilder sequence. |
| l | This long value will be inserted at given offset. |
Returns
The function returns reference to this StringBuilder object.
Example 8 insertoffset, l
In this example, we will initialize a StringBuilder, and insert a long value at offset 5.
Java Program
public class Example {
public static void main(String[] args) {
StringBuilder stringBuilder = new StringBuilder("abcdefghijk");
System.out.println("Before insert : " + stringBuilder.toString());
int offset = 5;
long l = 444852489;
stringBuilder.insert(offset, l);
System.out.println("After insert : " + stringBuilder.toString());
}
}
Output
Before insert : abcdefghijk After insert : abcde444852489fghijk
insertint dstOffset, CharSequence s
StringBuilder.insert() inserts the specified CharSequence into this StringBuilder sequence.
Syntax
The syntax of insert() function is
insert(int dstOffset, CharSequence s)
where
| Parameter | Description |
|---|---|
| dstOffset | The index at which insert operation happens in StringBuilder sequence. |
| s | This CharSequence will be inserted at given offset. |
Returns
The function returns reference to this StringBuilder object.
Example 9 insertdstOffset, s
In this example, we will initialize a StringBuilder, and insert a char sequence XYZ at offset 5.
Java Program
public class Example {
public static void main(String[] args) {
StringBuilder stringBuilder = new StringBuilder("abcdefghijk");
System.out.println("Before insert : " + stringBuilder.toString());
int offset = 5;
CharSequence s = "XYZ";
stringBuilder.insert(offset, s);
System.out.println("After insert : " + stringBuilder.toString());
}
}
Output
Before insert : abcdefghijk After insert : abcdeXYZfghijk
insertint dstOffset, CharSequence s, int start, int end
StringBuilder.insert() inserts a subsequence of the specified CharSequence into this StringBuilder sequence.
Syntax
The syntax of insert() function is
insert(int dstOffset, CharSequence s, int start, int end)
where
| Parameter | Description |
|---|---|
| dstOffset | The index at which insert operation happens in StringBuilder sequence. |
| s | This CharSequence value will be inserted at given offset. |
| start | The index at which subsequence starts in CharSequence s. |
| end | The index at which subsequence ends in CharSequence s. |
Returns
The function returns reference to this StringBuilder object.
Example 10 insertdstOffset, s, start, end
In this example, we will initialize a StringBuilder, and insert a sub sequence from CharSequence s, at offset 5 of StringBuilder sequence. The subsequence in s begin at start and stop at end.
Java Program
public class Example {
public static void main(String[] args) {
StringBuilder stringBuilder = new StringBuilder("abcdefghijk");
System.out.println("Before insert : " + stringBuilder.toString());
int offset = 5;
int start = 2;
int end = 5;
CharSequence s = "XYZ123456";
stringBuilder.insert(offset, s, start, end);
System.out.println("After insert : " + stringBuilder.toString());
}
}
Output
Before insert : abcdefghijk After insert : abcdeZ12fghijk
insertint offset, Object obj
StringBuilder.insert() inserts the string representation of the Object argument into this StringBuilder sequence.
Syntax
The syntax of insert() function is
insert(int offset, Object obj)
where
| Parameter | Description |
|---|---|
| offset | The index at which insert operation happens in StringBuilder sequence. |
| obj | This object’s string representation will be inserted at given offset. |
Returns
The function returns reference to this StringBuilder object.
Example 11 insertoffset, obj
In this example, we will initialize a StringBuilder, and insert an Object String value at offset 5. We will define a class Person and use its object to insert in StringBuilder sequence.
Java Program
public class Example {
public static void main(String[] args) {
StringBuilder stringBuilder = new StringBuilder("abcdefghijk");
System.out.println("Before insert : " + stringBuilder.toString());
int offset = 5;
Person obj = new Person("XYZ", 22);
stringBuilder.insert(offset, obj);
System.out.println("After insert : " + stringBuilder.toString());
}
}
class Person{
public String name;
int age;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
public String toString() {
return '[' + name + '-' + age + ']';
}
}
Output
Before insert : abcdefghijk After insert : abcde[XYZ-22]fghijk
insertint offset, String str
StringBuilder.insert() inserts the string into this StringBuilder sequence.
Syntax
The syntax of insert() function is
insert(int offset, String str)
where
| Parameter | Description |
|---|---|
| offset | The index at which insert operation happens in StringBuilder sequence. |
| str | The string we would like to insert in StringBuilder sequence. |
Returns
The function returns reference to this StringBuilder object.
Example 12 insertoffset, str
In this example, we will initialize a StringBuilder, and insert a string value "XYZ" at offset 5.
Java Program
public class Example {
public static void main(String[] args) {
StringBuilder stringBuilder = new StringBuilder("abcdefghijk");
System.out.println("Before insert : " + stringBuilder.toString());
int offset = 5;
String str = "XYZ";
stringBuilder.insert(offset, str);
System.out.println("After insert : " + stringBuilder.toString());
}
}
Output
Before insert : abcdefghijk After insert : abcdeXYZfghijk
Conclusion
In this Java Tutorial, we have learnt the syntax of Java StringBuilder.insert() function, and also learnt how to use this function with the help of examples.