java中print()方法写一个实例

下面是一个 Java 中使用 `print()` 方法的实例：

public class PrintExample {
    public static void main(String[] args) {
        int number = 10;
        double decimal = 3.14;
        String name = "Java";
        
        System.out.print("The number is: ");
        System.out.print(number);
        
        System.out.print("\nThe decimal is: ");
        System.out.print(decimal);
        
        System.out.print("\nThe name is: ");
        System.out.print(name);
    }
}

输出结果为：

The number is: 10
The decimal is: 3.14
The name is: Java

在这个例子中，我们定义了一个整型变量 `number`、一个浮点型变量 `decimal` 和一个字符串变量 `name`，然后使用 `print()` 方法输出这些变量的值。我们使用 `\n` 来换行输出。

相关问题

用Java写一个Student类，它有一个实例变量name，代表学生的名字，编写一个printName方法

public class Student {
private String name;

public Student(String name) {
this.name = name;
}

public void printName() {
System.out.println("Name: " + name);
}
}

用java中集合写几个实例

1. ArrayList实例：

import java.util.ArrayList;

public class ArrayListExample {
    public static void main(String[] args) {
        // create a new ArrayList
        ArrayList<String> names = new ArrayList<>();

        // add elements to the ArrayList
        names.add("Alice");
        names.add("Bob");
        names.add("Charlie");
        names.add("David");

        // print the ArrayList
        System.out.println(names);

        // access an element of the ArrayList
        System.out.println("The second element is " + names.get(1));

        // remove an element from the ArrayList
        names.remove(2);

        // print the ArrayList again
        System.out.println(names);

        // get the size of the ArrayList
        System.out.println("The size of the ArrayList is " + names.size());
    }
}

2. HashSet实例：

import java.util.HashSet;

public class HashSetExample {
    public static void main(String[] args) {
        // create a new HashSet
        HashSet<String> names = new HashSet<>();

        // add elements to the HashSet
        names.add("Alice");
        names.add("Bob");
        names.add("Charlie");
        names.add("David");

        // print the HashSet
        System.out.println(names);

        // check if an element is in the HashSet
        System.out.println("Is Bob in the HashSet? " + names.contains("Bob"));

        // remove an element from the HashSet
        names.remove("Charlie");

        // print the HashSet again
        System.out.println(names);

        // get the size of the HashSet
        System.out.println("The size of the HashSet is " + names.size());
    }
}

3. HashMap实例：

import java.util.HashMap;

public class HashMapExample {
    public static void main(String[] args) {
        // create a new HashMap
        HashMap<String, Integer> scores = new HashMap<>();

        // add key-value pairs to the HashMap
        scores.put("Alice", 90);
        scores.put("Bob", 80);
        scores.put("Charlie", 70);
        scores.put("David", 60);

        // print the HashMap
        System.out.println(scores);

        // access a value in the HashMap using the key
        System.out.println("Alice's score is " + scores.get("Alice"));

        // remove a key-value pair from the HashMap
        scores.remove("Charlie");

        // print the HashMap again
        System.out.println(scores);

        // get the size of the HashMap
        System.out.println("The size of the HashMap is " + scores.size());
    }
}