public class Classes implements Serializable{

本文介绍了一个Java实体类——Classes, 它用于表示班级信息,并包含与学生的一对多关联关系。该类实现了Serializable接口,拥有班级ID、名称、描述及学生集合等属性。

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package com.tfy.heibernate.mangtoone;


import java.io.Serializable;
import java.util.Set;


public class Classes implements Serializable{


private Long cid;
private String cname;
private String description;
private Set<Student> students;
public Long getCid() {
return cid;
}
public void setCid(Long cid) {
this.cid = cid;
}
public String getCname() {
return cname;
}
public void setCname(String cname) {
this.cname = cname;
}
public Set<Student> getStudents() {
return students;
}
public void setStudents(Set<Student> students) {
this.students = students;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}

}
// Step 1: Define the Operation interface. public interface Operation { public double apply(double num1, double num2); } // Step 2: Implement concrete strategy classes for each operation type. // Addition class implements addition logic. class AddOperation implements Operation { @Override public double apply(double num1, double num2) { return num1 + num2; } } // Subtraction class implements subtraction logic. class SubtractOperation implements Operation { @Override public double apply(double num1, double num2) { return num1 - num2; } } // Multiplication class implements multiplication logic. class MultiplyOperation implements Operation { @Override public double apply(double num1, double num2) { return num1 * num2; } } // Division class implements division logic with error handling. class DivideOperation implements Operation { @Override public double apply(double num1, double num2) throws ArithmeticException { if (num2 == 0){ throw new ArithmeticException("Cannot divide by zero."); }else{ return num1 / num2; } } } // Step 3: Create Context which uses an 'operation' object to perform actions on inputs given by user/client side code. public class CalculatorContext { private final Operation operation; // Constructor receives any subclass instance implementing Operation Interface as argument. public CalculatorContext(Operation opType){ this.operation=opType; } // Method invokes method defined inside passed Object during initialization phase above via constructor call. public double executeStrategy(double operandOne,double operandTwo)throws Exception{ return operation.apply(operandOne , operandTwo ); } }Main.java:2: error: interface Operation is public, should be declared in a file named Operation.java public interface Operation { ^ Main.java:45: error: class CalculatorContext is public, shou
最新发布
03-15
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