java.lang.String Api provides methods like indexOf(string) and contains(CharSequence) to check string contains substring in java
Method 1>
Program to find out string contains substring in java using indexOf(string) method in java>
indexOf(string) - Returns the index of the first occurrence of the specified substring in string.
If string does not contains substring method simply returns -1.
public class StringContainSubstringUsingIndexOfMethod {
public static void main(String[] args) {
String string = "java made so easy";
//Find index of 'made'
//Returns the index of the first occurrence of the specified substring in string.
if(string.indexOf("made") != -1){
System.out.println("index of 'made' is "+ string.indexOf("made"));
}
else{
System.out.println("string doesn't contains any substring 'made'");
}
}
}
/*OUTPUT
index of 'made' is 5
*/
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Method 2>
Program to find out string contains substring in java using contains(CharSequence s) method in java>
contains(CharSequence s) - contains method Returns true if and only if string contains the specified sequence of char values. If string does not contains substring method simply returns false.
public class StringContainSubstringUsingContainsMethod {
public static void main(String[] args) {
String string = "java made so easy";
//Find string contains substring 'made' or not
//contains method Returns true if and only if string
//contains the specified sequence of char values (i.e. 'made')
if(string.contains("made")){
System.out.println("string contains substring 'made'");
}
else{
System.out.println("string doesn't contains any substring 'made'");
}
}
}
/*OUTPUT
string contains substring 'made'
*/
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What about finding index of string from specified index>
Program to find out string contains substring in java from specified index using indexOf(string, int) method in java>
indexOf(string, int) - Returns the index of the first occurrence of the specified substring in string from specified index.
If string does not contains substring from specified index method simply returns -1.
public class StringContainSubstringUsingIndexOfMethod2 {
public static void main(String[] args) {
String string = "java made so easy made";
//Find index of 'made', start searching from specified index.
//Returns the index of the first occurrence of the specified substring in string from specified index.
if(string.indexOf("made", 10) != -1){
System.out.println("index of 'made' is "+ string.indexOf("made", 10));
}
else{
System.out.println("string doesn't contains any substring 'made'");
}
}
}
/*OUTPUT
index of 'made' is 18
*/
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In above program indexOf(string, int) will start searching ‘made’ from 10th index ‘s’ (i.e. in ‘so easy’ only)
Labels:
Core Java
String methods java