String in Java

String is the class (pre-defined) provide by java for storing the string value. It means when we create an object of string class then we can store a string value as. It is immutable. String is a Group of characters is called string. If we store a string value using string class then the length of the string will be fix means no further amendment will happen in that string.

String Method in Java

toLowercase()

convert the string into lowercase

Syntax

obj2=obj1.toLowerCase();

Example of toLowercase() in String method

Input Values

public class lowerf {
    
        public static void main(String args[]){  
        String a="BASICENGINNER";  
        String alower=a.toLowerCase();  
        System.out.println(alower);  
        }
}

toLowercase() in Java

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Output Values

toUppercase()

Convert the string into upper case

Syntax

obj=obj.touppercase();

Example of toUppercase() in String method.

Input Value

public class lowerf {
    
        public static void main(String args[]){  
        String a="BASICENGINNER student";  
        String alower=a.toUpperCase();  
        System.out.println(alower);  
        }
}

toUppercase() in Java

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Output Value

length()

This returns the length of the string including spaces. Length of the string means no. of characters

Syntax

int var=obj.length();

Example of length() in String method

Input Value

public class lowerf {
    
        public static void main(String args[]){  
        String a="BASICENGINNER student"; 
        System.out.println("string length is: "+a.length()); 
    
        }
}

length() in Java

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Output Value

replace()

This method replace all the occurrence of given character with new character

Syntax

obj2=obj1.replace(‘old’,’new’);

Example of replace() in String method

Input Value

public class lowerf {
    
        public static void main(String args[]){  
        String a="Baiseengineer student"; 
        String replaceString=a.replace('n','a');
        System.out.println(replaceString); 
    
        }
}

replace() in Java

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Output Value

trim()

It removes the blank spaces from left and right side of the given string.

Syntax

obj2=obj1.trim();

Example of trim() in String method

Input Value

public class lowerf {
     
        public static void main(String args[]){  
        String s1="  basic enginner    ";  
        System.out.println(s1+"student");  
        System.out.println(s1.trim()+"student"); 
        } 
    
}

trim() in Java

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Output Value

charAt()

This function returns the given position character.

Syntax

obj.charAt(index);

Example of charAt() in String method

Input Value

public class lowerf {
     
      
        public static void main(String args[]){  
        String name="student";  
        char a=name.charAt(3);  
        System.out.println(a);  
        } 
}

charAt() In Java

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Output Value

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