java利用反射机制如何实现获取对象的值

public class Engine implements java.io.Serializable { // Fields private Long engineId; private String engineName; private String engineType; // Constructors  public Engine() { }  public Engine(Long engineId) { this.engineId = engineId; } public Engine(String engineName, String engineType) { this.engineName = engineName; this.engineType = engineType; }  public Engine(Long engineId, String engineName, String engineType) { this.engineId = engineId; this.engineName = engineName; this.engineType = engineType; } // Property accessors public Long getEngineId() { return this.engineId; } public void setEngineId(Long engineId) { this.engineId = engineId; } public String getEngineName() { return this.engineName; } public void setEngineName(String engineName) { this.engineName = engineName; } public String getEngineType() { return this.engineType; } public void setEngineType(String engineType) { this.engineType = engineType; }public static void main(String[] args) throws Exception { Engine m = new Engine("汽车","发动机"); Class clazz = m.getClass(); Field[] f = clazz.getDeclaredFields(); String[] name = field2Name(f); Object[] value = field2Value(f, m); showNameAndValue(name, value); } public static void showNameAndValue(String[] name, Object[] value) { for (int i = 0; i < name.length; i++) {  System.out.println("--" + i + "--");  System.out.println("name:" + name[i]);  System.out.println("Value:" + value[i]);  System.out.println("--   --"); } } public static String[] field2Name(Field[] f) { String[] name = new String[f.length]; for (int i = 0; i < f.length; i++) {  name[i] = f[i].getName(); } return name; } public static Object[] field2Value(Field[] f, Object o) throws Exception { Object[] value = new Object[f.length]; for (int i = 0; i < f.length; i++) {  value[i] = f[i].get(o); } return value; }}