Java String: valueOf() Method
valueOf() Method
Contents:
- public static String valueOf(char c)
- public static String valueOf(int i)
- public static String valueOf(long l)
- public static String valueOf(float f)
- public static String valueOf(boolean b)
- public static String valueOf(double d)
- public static String valueOf(char[] data)
- public static String valueOf(char[] data, int offset, int count)
- public static String valueOf(Object obj)
public static String valueOf(char c)
The valueOf() method is used to get the string representation of the char argument.
Java Platform: Java SE 8
Syntax:
valueOf(char c)
Parameters:
Name | Description | Type |
---|---|---|
C | a char. | char |
Return Value: A string of length 1 containing as its single character the argument c.
Return Value Type: char
Example: Java String valueOf(char c) Method
The following example shows the usage of java String() method.
public class StringValueOfChar {
public static void main(String[] args) {
// declare a sample string value
String strValue = "Python";
// convert strValue to character array
char[] values = strValue.toCharArray();
// for each element on char array
for(char c:values){
// print the String value of char c
System.out.println(String.valueOf(c));
}
}
}
Output:
P y t h o n
public static String valueOf(int i)
Returns the string representation of the int argument.
The representation is exactly the one returned by the Integer.toString method of one argument.
Java Platform: Java SE 8
Syntax:
valueOf(int i)
Parameters:
Name | Description | Type |
---|---|---|
i | an int. | int |
Return Value: A string representation of the int argument.
Return Value Type: int
Example: Java String valueOf(int i) Method
The following example shows the usage of java String() method.
public class StringValueOfInteger {
public static void main(String[] args) {
int val = 1;
Integer i = 50;
System.out.println(String.valueOf(val));
System.out.println(String.valueOf(i));
System.out.println(String.valueOf(-3));
}
}
Output:
1 50 -3
public static String valueOf(long l)
Returns the string representation of the long argument.
The representation is exactly the one returned by the Long.toString method of one argument.
Java Platform: Java SE 8
Syntax:
valueOf(long l)
Parameters:
Name | Description | Type |
---|---|---|
l | a long. | String |
Return Value: A string representation of the long argument.
Return Value Type: String
Example: Java String valueOf(long l) Method
The following example shows the usage of java String() method.
public class StringValueOfLong {
public static void main(String[] args) {
// primitive long declaration
long val = 1;
// Object of Long data type
Long valueLong = 50l;
System.out.println(String.valueOf(val));
System.out.println(String.valueOf(valueLong));
System.out.println(String.valueOf(12345));
}
}
Output:
1 50 12345
public static String valueOf(float f)
Returns the string representation of the float argument. The representation is exactly the one returned by the Float.toString method of one argument.
Java Platform: Java SE 8
Syntax:
valueOf(float f)
Parameters:
Name | Description | Type |
---|---|---|
f | a float. | String |
Return Value: A string representation of the float argument.
Return Value Type: String
Example: Java String valueOf(float f) Method
The following example shows the usage of java String() method.
public class StringValueOfFloat {
public static void main(String[] args) {
// primitive float declaration
float val = 1.0f;
// Object of Float data type
Float valueFloat = 50.125f;
System.out.println(String.valueOf(val));
System.out.println(String.valueOf(valueFloat));
System.out.println(String.valueOf(125.125f));
}
}
Output:
1.0 50.125 125.125
public static String valueOf(boolean b)
Returns the string representation of the boolean argument.
Java Platform: Java SE 8
Syntax:
valueOf(boolean b)
Parameters:
Name | Description | Type |
---|---|---|
b | a boolean. | String |
Return Value: If the argument is true, a string equal to "true" is returned; otherwise, a string equal to "false" is returned.
Return Value Type: boolean
Example: Java String valueOf(boolean b) Method
The following example shows the usage of java String() method.
public class StringValueOfBoolean {
public static void main(String[] args) {
// declare a sample string value
String strValue = " John Gilbert-Male-UK";
// check if String value contains a specific string
boolean bool = strValue.contains("Male");
// print the string equivalent of our boolean check
System.out.println(String.valueOf(bool));
}
}
Output:
true
public static String valueOf(double d)
Returns the string representation of the double argument.
The representation is exactly the one returned by the Double.toString method of one argument.
Java Platform: Java SE 8
Syntax:
valueOf(double d)
Parameters:
Name | Description | Type |
---|---|---|
d | a double. | String |
Return Value: A string representation of the double argument.
Return Value Type: String
Example: Java String valueOf(double d) Method
The following example shows the usage of java String() method.
public class StringValueOfFloat {
public static void main(String[] args) {
// primitive double declaration
double val = 1.0123;
// Object of Double data type
Double valueDouble = 50.123125;
System.out.println(String.valueOf(val));
System.out.println(String.valueOf(valueDouble));
System.out.println(String.valueOf(23.125125));
}
}
Output:
1.0125 50.123125 23.125125
public static String valueOf(char[] data)
Returns the string representation of the char array argument.
The contents of the character array are copied; subsequent modification of the character array does not affect the returned string.
Java Platform: Java SE 8
Syntax:
valueOf(char[] data)
Parameters:
Name | Description | Type |
---|---|---|
data | the character array. | String |
Return Value: a String that contains the characters of the character array.
Return Value Type: String
Example: Java String valueOf(char[] data) Method
The following example shows the usage of java String() method.
public class StringValueOfExample {
public static void main(String[] args) {
// declare the character array
char[] data = new char[]{'m','n','o','p'};
// getting the String equivalent of char array data
String strVal = String.valueOf(data);
// printing the String equivalent of char array
System.out.println(strVal);
// Change the value of char array
// Convert a string to char array
data = "test".toCharArray();
// check if the strVal has been changed by
// Reinitializing the data array
System.out.println("After Reinitialization: "+strVal);
}
}
Output:
mnop After Reinitialization: mnop
public static String valueOf(char[] data, int offset, int count)
Returns the string representation of a specific subarray of the char array argument.
The offset argument is the index of the first character of the subarray. The count argument specifies the length of the subarray. The contents of the subarray are copied; subsequent modification of the character array does not affect the returned string.
Java Platform: Java SE 8
Syntax:
valueOf(char[] data, int offset, int count)
Parameters:
Name | Description | Type |
---|---|---|
data | the character array. | String |
offset | initial offset of the subarray. | int |
count | the length of the subarray. | int |
Return Value: a String that contains the characters of the character array.
Return Value Type:
Throws:
IndexOutOfBoundsException - if offset is negative, or count is negative, or offset+count is larger than data.length.
Example: Java String valueOf(char[] data, int offset, int count) Method
The following example shows the usage of java String() method.
public class StringValueOfExample {
public static void main(String[] args) {
// declare the character array
char[] data = new char[]{'w','3','r','e','s','o','u','r','c','e'};
// declaring the index of our char array to start
int offset = 0;
// number of characters we are getting on the character array
// starting from offset argument
int count = 10;
// getting the String equivalent of char array data
String strVal = String.valueOf(data,offset,count);
// printing the String equivalent of char array
System.out.println();
System.out.println(strVal);
// change the value of char array
// convert a string to char array
data = "test".toCharArray();
// check if the strVal has been changed by
// reinitializing the data array
System.out.println("After Reinitialization: "+strVal);
System.out.println();
}
}
Output:
w3resource After Reinitialization: w3resource
Example of Throws: valueOf(char[] data, int offset, int count) Method
IndexOutOfBoundsException - if offset is negative, or count is negative, or offset+count is larger than data.length.
Let
int offset = -1; int count = 12;
in the above example.
Output:
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String in dex out of range: -1 at java.lang.String.<init>(String.java:192) at java.lang.String.valueOf(String.java:3032) at StringValueOfExample.main(StringValueOfExample.java:12)
public static String valueOf(Object obj)
Returns the string representation of the Object argument.
Java Platform: Java SE 8
Syntax:
valueOf(Object obj)
Parameters:
Name | Description | Type |
---|---|---|
obj | an Object. | String |
Return Value: if the argument is null, then a string equal to "null"; otherwise, the value of obj.toString() is returned.
Return Value Type: String
The following example shows the usage of java String() method.
import java.lang.*;
public class StringExample {
public static void main(String[] args) {
String str = "Java String";
Object objValue= str;
System.out.println();
// returns the string representation of the Object argument
System.out.println("Value = " + str.valueOf(objValue));
System.out.println();
}
}
Output:
Value = Java String
Java Code Editor:
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