上面代码修改一下,不使用toString方法,只使用equals方法输出结果
时间: 2024-10-12 18:06:45 浏览: 16
如果你想直接在equals方法中输出结果而不是通过toString方法,你可以这样做:
```java
@Override
public boolean equals(Object obj) {
if (this == obj) {
System.out.println("同一只鸟");
return true;
} else if (obj instanceof Bird) {
Bird otherBird = (Bird) obj;
if (this.color.equals(otherBird.color) && this.size == otherBird.size) {
System.out.println("同一只鸟");
return true;
} else {
System.out.println("不同一只鸟");
}
}
return false;
}
```
现在当你调用`equals`方法时,它会直接在控制台打印出比较结果,无需额外的toString方法。不过通常来说,我们更倾向于在toString方法中提供对象的完整描述,而在equals方法中处理比较逻辑。
相关问题
定义一个名为Square的类表示正方形,它有一个名为length的成员变量表示边长,一个带参数的构造方法,要求该类能够调用clone()方法进行克隆。覆盖父类的equals()方法,当边长相等时认为两个Square对象相等。覆盖父类的toString()方法,要求当调用该方法输出Square对象格式如下:Square[length=100],这里100表示边长。编写一个程序测试clone(),equals(),和tostring()方法的使用
好的,以下是符合您要求的Square类的代码:
```
public class Square implements Cloneable {
private int length;
public Square(int length) {
this.length = length;
}
public Square clone() {
try {
return (Square) super.clone();
} catch (CloneNotSupportedException e) {
return null;
}
}
@Override
public boolean equals(Object obj) {
if (obj instanceof Square) {
Square other = (Square) obj;
return this.length == other.length;
}
return false;
}
@Override
public String toString() {
return "Square[length=" + length + "]";
}
}
```
下面是使用示例:
```
public class SquareTest {
public static void main(String[] args) {
Square s1 = new Square(100);
Square s2 = s1.clone();
System.out.println(s1.equals(s2)); // true
System.out.println(s1.toString()); // Square[length=100]
System.out.println(s2.toString()); // Square[length=100]
s2 = new Square(200);
System.out.println(s1.equals(s2)); // false
System.out.println(s2.toString()); // Square[length=200]
}
}
```
在上面的示例中,我们创建了一个Square对象s1,然后通过调用clone()方法创建了一个新的Square对象s2。由于我们覆盖了equals()方法,当s1和s2的边长都为100时,它们被认为是相等的。我们还覆盖了toString()方法,使其返回符合要求的格式。最后,我们通过修改s2的边长来测试equals()方法的正确性。
任务1: 写一个名为Rectangle的类表示矩形。其属性包括宽width、高height和颜色color,width和height都是double型的,而color则是String类型的。要求该类具有: (1) 使用构造函数完成各属性的初始赋值 (2) 使用getter和setter的形式完成属性的访问及修改 (3) 提供计算面积的getArea()方法 (4) 重写toString()方法,输出矩形信息 (5) 自己增加与Rectangle类相关的方法 任务2:声明复数类Complex,成员变量包括实部和虚部,类型均为double。要求该类具有 (1) 实现多个构造方法(如无参构造方法、1个参数构造方法,2个参数构造方法,字符串参数的构造方法)。 (2) 使用getter和setter完成属性的访问和修改 (3) 成员方法包括实现复数加法add、减法minus、乘法multiply,计算模长length (4) 重写equals()方法,只有当两个复数实部和虚部都相等时,才返回真 (5) 重写toString(),输出复数信息 (6) 在main方法中,使用实际数据测试成员方法
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下面是您提出的任务:
任务1:Rectangle类的代码如下:
```java
public class Rectangle {
private double width;
private double height;
private String color;
public Rectangle(double width, double height, String color) {
this.width = width;
this.height = height;
this.color = color;
}
public double getWidth() {
return width;
}
public void setWidth(double width) {
this.width = width;
}
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public double getArea() {
return width * height;
}
@Override
public String toString() {
return "Rectangle{" +
"width=" + width +
", height=" + height +
", color='" + color + '\'' +
'}';
}
public String getColorAndSize() {
return "This rectangle is " + color + " and has a width of " + width + " and a height of " + height;
}
}
```
任务2:Complex类的代码如下:
```java
public class Complex {
private double real;
private double imaginary;
public Complex() {
this.real = 0;
this.imaginary = 0;
}
public Complex(double real) {
this.real = real;
this.imaginary = 0;
}
public Complex(double real, double imaginary) {
this.real = real;
this.imaginary = imaginary;
}
public Complex(String str) {
String[] parts = str.split("\\+|i");
this.real = Double.parseDouble(parts[0]);
this.imaginary = Double.parseDouble(parts[1]);
}
public double getReal() {
return real;
}
public void setReal(double real) {
this.real = real;
}
public double getImaginary() {
return imaginary;
}
public void setImaginary(double imaginary) {
this.imaginary = imaginary;
}
public Complex add(Complex other) {
return new Complex(this.real + other.real, this.imaginary + other.imaginary);
}
public Complex minus(Complex other) {
return new Complex(this.real - other.real, this.imaginary - other.imaginary);
}
public Complex multiply(Complex other) {
double newReal = this.real * other.real - this.imaginary * other.imaginary;
double newImaginary = this.real * other.imaginary + this.imaginary * other.real;
return new Complex(newReal, newImaginary);
}
public double length() {
return Math.sqrt(this.real * this.real + this.imaginary * this.imaginary);
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj == null || obj.getClass() != this.getClass()) {
return false;
}
Complex other = (Complex) obj;
return Double.compare(this.real, other.real) == 0 && Double.compare(this.imaginary, other.imaginary) == 0;
}
@Override
public String toString() {
return this.real + "+" + this.imaginary + "i";
}
}
```
在main方法中,我们可以测试Rectangle类和Complex类的各项功能,例如:
```java
public static void main(String[] args) {
Rectangle rectangle = new Rectangle(5, 10, "blue");
System.out.println(rectangle); // 输出:Rectangle{width=5.0, height=10.0, color='blue'}
System.out.println(rectangle.getColorAndSize()); // 输出:This rectangle is blue and has a width of 5.0 and a height of 10.0
System.out.println(rectangle.getArea()); // 输出:50.0
Complex c1 = new Complex(1, 2);
Complex c2 = new Complex(3, 4);
System.out.println(c1.add(c2)); // 输出:4.0+6.0i
System.out.println(c1.minus(c2)); // 输出:-2.0-2.0i
System.out.println(c1.multiply(c2)); // 输出:-5.0+10.0i
System.out.println(c1.length()); // 输出:2.23606797749979
System.out.println(c1.equals(new Complex(1, 2))); // 输出:true
System.out.println(c1.equals(new Complex(2, 1))); // 输出:false
System.out.println(c1); // 输出:1.0+2.0i
}
```
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