Extending Java Classes - Java Scripting

Introduction

Javascript file

var Employee = Java.type("org.yourpackage.Employee");
var bigDecimal = Java.type("java.math.BigDecimal");
var Developer = Java.extend(Employee, {
    grossPay: function(hours, rate){
        var bonus = 500;
        return hours.multiply(rate).add(new bigDecimal(bonus));
    }
});

var javaDev = new Developer();
javaDev.first = "Joe";
javaDev.last = "Dynamic";
print(javaDev + "'s gross pay for the week is: " + javaDev.grossPay(new bigDecimal(60), new bigDecimal(80)));

package org.yourpackage;

import java.util.Date;

public class Employee {
    private int age;
    private String first;
    private String last;
    private String position;
    private Date hireDate;
    
    public Employee(){
        
    }
    
    public Employee(String first,
                    String last,
                    Date hireDate){
        this.first = first;
        this.last = last;
        this.hireDate = hireDate;
    }

    /**
     * @return the age
     */
    public int getAge() {
        return age;
    }

    /**
     * @param age the age to set
     */
    public void setAge(int age) {
        this.age = age;
    }

    /**
     * @return the first
     */
    public String getFirst() {
        return first;
    }

    /**
     * @param first the first to set
     */
    public void setFirst(String first) {
        this.first = first;
    }

    /**
     * @return the last
     */
    public String getLast() {
        return last;
    }

    /**
     * @param last the last to set
     */
    public void setLast(String last) {
        this.last = last;
    }

    /**
     * @return the position
     */
    public String getPosition() {
        return position;
    }

    /**
     * @param position the position to set
     */
    public void setPosition(String position) {
        this.position = position;
    }

    /**
     * @return the hireDate
     */
    public Date getHireDate() {
        return hireDate;
    }

    /**
     * @param hireDate the hireDate to set
     */
    public void setHireDate(Date hireDate) {
        this.hireDate = hireDate;
    }
    
    public String toString(){
        return first + " " + last;
    }
    
    public BigDecimal grossPay(BigDecimal hours, BigDecimal rate){
        return hours.multiply(rate);
    }
}



import java.util.logging.Level;
import java.util.logging.Logger;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class Main {
    public static void main(String[] args){

        ScriptEngineManager sem = new ScriptEngineManager();
        ScriptEngine nashorn = sem.getEngineByName("nashorn");
        try {
            nashorn.eval("load('test.js');");
        } catch (ScriptException ex) {
            Logger.getLogger(Recipe18_9.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

Extending Java Classes - Java Scripting

Introduction

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