Java 手机类示例：封装属性、构造方法和 getter/setter

public class Phone { private String brand; private double price; private String color;

public Phone() {}

public Phone(String brand, double price, String color) {
    this.brand = brand;
    this.price = price;
    this.color = color;
}

public String getBrand() {
    return brand;
}

public void setBrand(String brand) {
    this.brand = brand;
}

public double getPrice() {
    return price;
}

public void setPrice(double price) {
    this.price = price;
}

public String getColor() {
    return color;
}

public void setColor(String color) {
    this.color = color;
}

public void print() {
    System.out.println('Brand: ' + brand);
    System.out.println('Price: ' + price);
    System.out.println('Color: ' + color);
}

}