How to convert Java Object to String

In Java, an object can be converted into a String by using the toString() and valueOf() method. Both the methods belong to String class. We can convert an object into a String irrespective of whether it is a user-defined class, StringBuffer, StringBuilder, etc.

Example 1:

Here, the object of the class Student which is a user-defined class that is converted into String.

package com.studytonight;

class Student   // user-defined class
{
	String name;
	int id;
	
	public Student(String name, int id) {
		super();
		this.name = name;
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	@Override
	public String toString() {
		return "Name: "+name+" Id: "+id;
	}
}
public class StudyTonight
{  
	public static void main(String args[])
	{  
		Student ob = new Student("Irfan",12); //object of user-defined class Student
		System.out.println(ob +" "+ob.getClass());
		String s1 = ob.toString();  
		System.out.println(s1+" "+s1.getClass());    
	}
}

Name: Irfan Id: 12 class com.studytonight.Student
Name: Irfan Id: 12 class java.lang.String

Example 2:

Here, the StringBuilder class object is converted into String.

public class StudyTonight
{  
	public static void main(String args[])
	{  
		String s = "Welcome to studytonight";  
		StringBuilder sb = new StringBuilder(s);
		String sr = sb.toString();
		System.out.println("String is: "+sr);
	}
}

String is: welcome to studytonight