用java编写js

import javax.script.ScriptEngineManager;
import javax.script.ScriptEngine;
import javax.script.ScriptException;

public class JavaExecuteJs {
    public static void main(String[] args) {
        // 创建一个ScriptEngineManager对象
        ScriptEngineManager manager = new ScriptEngineManager();
        
        // 获取JavaScript引擎
        ScriptEngine engine = manager.getEngineByName("JavaScript");
        
        try {
            // 执行JavaScript代码
            String jsCode = "function add(a, b) { return a + b; } add(1, 2);";
            Object result = engine.eval(jsCode);
            
            // 输出结果
            System.out.println("Result: " + result); // 输出：Result: 3
        } catch (ScriptException e) {
            e.printStackTrace();
        }
    }
}