import java.util.ArrayList;
import java.util.List;
public class CollectionExample {
public static void main(String[] args) {
List<String> list = new ArrayList<>();
list.add("Java");
list.add("Python");
list.add("C++");
list.remove("Python");
for (String language : list) {
System.out.println(language);
}
}
}
public class StringExample {
public static void main(String[] args) {
String str1 = "Hello";
String str2 = "World";
String result = str1 + ", " + str2;
System.out.println(result);
String subStr = str1.substring(1, 3);
System.out.println(subStr);
String newStr = str2.replace("World", "Java");
System.out.println(newStr);
}
}
import java.util.Date;
import java.text.SimpleDateFormat;
public class DateTimeExample {
public static void main(String[] args) {
Date date = new Date();
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
String formattedDate = format.format(date);
System.out.println("Formatted Date: " + formattedDate);
Date anotherDate = new Date(2021, 10, 1);
long diff = date.getTime() - anotherDate.getTime();
long days = diff / (1000 * 60 * 60 * 24);
System.out.println("Days Difference: " + days);
}
}
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
public class IOExample {
public static void main(String[] args) {
try {
File file = new File("example.txt");
FileOutputStream outputStream = new FileOutputStream(file);
outputStream.write("Hello, Java!".getBytes());
outputStream.close();
byte[] buffer = new byte[1024];
FileInputStream inputStream = new FileInputStream(file);
int length = inputStream.read(buffer);
String content = new String(buffer, 0, length);
inputStream.close();
System.out.println("File Content: " + content);
} catch (IOException e) {
e.printStackTrace();
}
}
}
