Java通过对象产生的类获取对象所拥有变量的值

未分类

public class Test01 {
    private static String value1 = "private static value1";
    public static String value2 = "public static value2";
    private String value3 = "private value3";
    public String value4 = "public value4";
    public String value5 = "public value5";
    public static void main(String[] args) {
        Test01 test01 = new Test01();
        Field[] declaredFields = test01.getClass().getDeclaredFields();
        for (Field field : declaredFields) {
            try {
                // 显示所有被声明的变量(包括私有变量和类变量)的值,如果为非法访问则报异常
                System.out.println("declaredFields : " + "\tname : "+field.getName() + "\tmodifiers : "+ Modifier.toString(field.getModifiers())+ "\tvalue : "+field.get(test01));
            } catch (IllegalArgumentException | IllegalAccessException e) {
                e.printStackTrace();
            }
        }
        Field[] fields = test01.getClass().getFields();
        for (Field field : fields) {
            try {
                //显示所有类中可以被正常访问的 (accessible public fields of the class) public 字段,如果为非法访问则报异常
                System.out.println("Fields : " + "\tname : "+field.getName() + "\tmodifiers : "+Modifier.toString(field.getModifiers()) + "\tvalue : "+field.get(test01));
            } catch (IllegalArgumentException | IllegalAccessException e) {
                e.printStackTrace();
            }
        }
    }
    //循环检查私有成员变量是否为空,只要有一个私有成员变量为空则返回false
    public boolean checkRequired() {
        Field[] declaredFields = this.getClass().getDeclaredFields();
        for (Field field : declaredFields) {
            if(Modifier.isPrivate(field.getModifiers()) && !Modifier.isStatic(field.getModifiers())){
                try {
                    if(field.get(this) == null)return false;
                } catch (IllegalArgumentException | IllegalAccessException e) {
                    return false;
                }
            }
        }
        return true;
    }
}