JavaSE 反射——反编译Constructor

反编译Constructor

public class User {
    
    

	public int id;
	
	private String name;
	
	String address;
	
	protected int sno;
	
	public User() {
    
    }
	
	public User(int id, String name, String address, int sno) {
    
    
		super();
		this.id = id;
		this.name = name;
		this.address = address;
		this.sno = sno;
	}
	
	public void study() {
    
    
		System.out.println("study...");
	}
	
	public void eat(int a,String b) {
    
    
		System.out.println("eat...");
	}

	@Override
	public String toString() {
    
    
		return "User [id=" + id + ", name=" + name + ", address=" + address + ", sno=" + sno + "]";
	}

	@Override
	public int hashCode() {
    
    
		final int prime = 31;
		int result = 1;
		result = prime * result + ((address == null) ? 0 : address.hashCode());
		result = prime * result + id;
		result = prime * result + ((name == null) ? 0 : name.hashCode());
		result = prime * result + sno;
		return result;
	}

	@Override
	public boolean equals(Object obj) {
    
    
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		User other = (User) obj;
		if (address == null) {
    
    
			if (other.address != null)
				return false;
		} else if (!address.equals(other.address))
			return false;
		if (id != other.id)
			return false;
		if (name == null) {
    
    
			if (other.name != null)
				return false;
		} else if (!name.equals(other.name))
			return false;
		if (sno != other.sno)
			return false;
		return true;
	}
}

public class Test {
    
    
	public static void main(String[] args) throws Exception {
    
    
		StringBuilder s = new StringBuilder();
        Class userClass = Class.forName("com.lzj.reflect.pojo.User");
        s.append(Modifier.toString(userClass.getModifiers()));
        s.append(" class ");
        s.append(userClass.getSimpleName());
        s.append("{\n");

        // 拼接构造方法
        Constructor[] constructors = userClass.getDeclaredConstructors();
        for(Constructor constructor : constructors){
    
    
            s.append("\t");
            s.append(Modifier.toString(constructor.getModifiers()));
            s.append(" ");
            s.append(userClass.getSimpleName());
            s.append("(");

            Class[] parameterTypes = constructor.getParameterTypes();
            for(Class parameterType : parameterTypes){
    
    
                s.append(parameterType.getSimpleName());
                s.append(",");
            }
            if(parameterTypes.length > 0){
    
    
                s.deleteCharAt(s.length() - 1);
            }
            s.append("){}\n");
        }

        s.append("}");
        System.out.println(s);
	}
}