# Methods of class String

![](/files/-LTb6mfvAdCg8ERqJZdS)

### Method : charAt()

![](/files/-LTb7RkJiKscKanevPaM)

![](/files/-LTb7XFStsFuQTgm0EuV)

```java
package com.test.test1;

public class StringMethods {
	public static void main(String[] args) {
		String name = new String("Paul");
		System.out.println(name.charAt(0));
		System.out.println(name.charAt(2));
	}
}
```

### Method : indexOf()  

![](/files/-LTb9HMln6CimWSkn5jZ)

```java
package com.test.test1;

public class StringMethods {
	public static void main(String[] args) {
		String name = new String("ABCAB");
		System.out.println(name.indexOf('B'));
		System.out.println(name.indexOf("S"));
		System.out.println(name.indexOf("CA"));
		System.out.println(name.indexOf("B", 2));
	}
}
```

### Method : substring()  

![](/files/-LTbD-qGrbXOCT4spZib)

![](/files/-LTbDB_jxhXodVsV6I3J)

![](/files/-LTbDKAja1LXMN7XRDus)

![](/files/-LTbDOY3l-Vl5HmLsQMu)

```java
package com.test.test1;

public class StringMethods {
	public static void main(String[] args) {
		String exam = "Oracle";
		String sub = exam.substring(2);
		String result = exam.substring(2, 4);
		System.out.println(sub);
		System.out.println(result);
	}
}
```

### Method : trim()

![](/files/-LTbDuJ3KwBmyUAHGSAs)

```java
package com.test.test1;

public class StringMethods {
	public static void main(String[] args) {
		String varWithSpaces = "  AB CB   ";
		System.out.print(":");
		System.out.print(varWithSpaces);
		System.out.println(":");
		System.out.println("---after trim---");
		System.out.println(varWithSpaces.trim());
	}
}
```

#### Note: trim() will not remove space with in a string.

### Method  : replace()

![](/files/-LTbGACxerkAweJv321o)

```java
package com.test.test1;

public class StringMethods {
	public static void main(String[] args) {
		String letters = "ABCAB";
		System.out.println(letters.replace('B', 'b'));
		System.out.println(letters.replace("CA", "12"));
		System.out.println(letters);
	}
}
```

```
Output:
AbCAb
AB12B
ABCAB
```

### Method : length()

![](/files/-LTbHBd5HL7BXQbfxDG0)

```java
package com.test.test1;

public class StringMethods {
	public static void main(String[] args) {
		String letters = "ABCAB";
		System.out.println(letters.length());
	}
}
```

{% hint style="danger" %}
length of a string is always = lastIndex+1  
{% endhint %}

### Methods : startsWith() and endsWith()

![](/files/-LTbHnLl3x8iY7RQ-rTQ)

![](/files/-LTbHs_5rt-WyuyTI18K)

```java
package com.test.test1;

public class StringMethods {
	public static void main(String[] args) {
		String letters = "ABCAB";
		System.out.println(letters.startsWith("AB"));
		System.out.println(letters.startsWith("a"));
		System.out.println(letters.startsWith("A", 3));

		System.out.println(letters.endsWith("CAB"));
		System.out.println(letters.endsWith("B"));
		System.out.println(letters.endsWith("b"));
	}
}
```

## Method Chaining

![](/files/-LTbPquUMKV7ui38Rw1p)

```java
package com.test.test1;

public class StringMethods {
	public static void main(String[] args) {
		String result = "Sunday  ".replace(' ', 'Z').trim().concat("M n");
		System.out.println(result);
	}
}
```

![](/files/-LTbROxCHBKpEJkuwxsH)

```java
package com.test.test1;

public class StringMethods {
	public static void main(String[] args) {
		String day = "SunDday";
		day.replace('D', 'Z').substring(3);
		System.out.println(day);
		day = day.replace('D', 'Z').substring(3);
		System.out.println(day);
	}
}
```

<br>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://gyansetu-java.gitbook.io/core-java/string/methods-of-class-string.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.