java 循环把对象属性 输出

Posted 2023-05-08

要把 对象属性的值 循环 输出 ，不要一个一个属性 输出，对象名.属性 ...属性 太多，有办法 一次 输出 全部属性么
写成这样了...
import java.lang.reflect.Field;

Class cla = gooddetail.getClass();
Field[] field = cla.getDeclaredFields();
for(Object str : field)
System.out.println(str.toString());

参考技术A // 你用这个类吧，我写的，平常调试用的

package com.yao.util.bean;

import java.lang.reflect.Method;

import com.yao.util.string.StringUtil;

public class BeanUtil

/**
* 打印对象
*
* @param o
*/
public static String toObjectString(Object o)
return toObjectString(o, 1);


private static String toObjectString(Object o, int dep)

if (null == o) return null;

StringBuffer c = new StringBuffer();

Class<?> clazz = o.getClass();
Method[] methods = clazz.getMethods();

c.append(o.getClass().getSimpleName()).append(" ").append("\n");

for (Method method : methods)
String mname = method.getName();
Class<?> type = method.getReturnType();
if (mname.length() <= 3 || mname.equals("getClass"))
continue;


if (mname.substring(0, 3).equals("get"))

try
Object returnO = method.invoke(o, new Object[] );
mname = mname.replaceFirst("get", "");
mname = StringUtil.toLowerCase(mname.charAt(0) + "") + mname.substring(1);
c.append(StringUtil.repeat(" ", dep)).append(type.getSimpleName()).append(" ").append(mname);

if (null == type.getPackage() || type.getPackage().equals(Package.getPackage("java.lang")))
c.append(" = ").append(StringUtil.toCodeString(returnO));
else
c.append(" = ").append(toObjectString(returnO, dep + 1));


c.append(";").append("\n");
catch (Exception e)
// e.printStackTrace();



c.append(StringUtil.repeat(" ", dep - 1)).append("");
return c.toString();


public static void main(String[] args) throws SecurityException, NoSuchMethodException
TestBean test = new TestBean();

test.setA(54);
test.setB("asdf");
test.setC(587483L);

System.out.println(BeanUtil.toObjectString(test));


public static class TestBean

private int a;
private String b;
private Long c;

public int getA()
return a;


public void setA(int a)
this.a = a;


public String getB()
return b;


public void setB(String b)
this.b = b;


public Long getC()
return c;


public void setC(Long c)
this.c = c;


@Override
public String toString()
String str = a + " | " + b + " | " + c;
return str;



参考技术B // 你用这个类吧，我写的，平常调试用的

package com.yao.util.bean;

import java.lang.reflect.Method;

import com.yao.util.string.StringUtil;

public class BeanUtil

/**
* 打印对象
*
* @param o
*/
public static String toObjectString(Object o)
return toObjectString(o, 1);


private static String toObjectString(Object o, int dep)

if (null == o) return null;

StringBuffer c = new StringBuffer();

Class<?> clazz = o.getClass();
Method[] methods = clazz.getMethods();

c.append(o.getClass().getSimpleName()).append(" ").append("\n");

for (Method method : methods)
String mname = method.getName();
Class<?> type = method.getReturnType();
if (mname.length() <= 3 || mname.equals("getClass"))
continue;


if (mname.substring(0, 3).equals("get"))

try
Object returnO = method.invoke(o, new Object[] );
mname = mname.replaceFirst("get", "");
mname = StringUtil.toLowerCase(mname.charAt(0) + "") + mname.substring(1);
c.append(StringUtil.repeat(" ", dep)).append(type.getSimpleName()).append(" ").append(mname);

if (null == type.getPackage() || type.getPackage().equals(Package.getPackage("java.lang")))
c.append(" = ").append(StringUtil.toCodeString(returnO));
else
c.append(" = ").append(toObjectString(returnO, dep + 1));


c.append(";").append("\n");
catch (Exception e)
// e.printStackTrace();



c.append(StringUtil.repeat(" ", dep - 1)).append("");
return c.toString();


public static void main(String[] args) throws SecurityException, NoSuchMethodException
TestBean test = new TestBean();

test.setA(54);
test.setB("asdf");
test.setC(587483L);

System.out.println(BeanUtil.toObjectString(test));


public static class TestBean

private int a;
private String b;
private Long c;

public int getA()
return a;


public void setA(int a)
this.a = a;


public String getB()
return b;


public void setB(String b)
this.b = b;


public Long getC()
return c;


public void setC(Long c)
this.c = c;


@Override
public String toString()
String str = a + " | " + b + " | " + c;
return str;



参考技术C 使用Object下的getclass()反射机制，具体介绍随便java书上都有吧。 参考技术D 用反射啊本回答被提问者采纳

JAVA循环获取值

已知某实体类属性分别以英文数字one、two、three、...ten命名，提供了set、get的方法，求如何通过循环分别获取getOne()、getTwo()、getThree()、...getTen()的值
for(int i=1;i<=10;i++)

test.get(这里填One、Two、Three、...Ten)()

这个只能先把实体放到list里面，然后遍历就一次输出了。
List countList=new ArrayList（）；
countList.add(one);
...
countList.add(ten);
for(int i=0;i<countList.size();i++)
test = countList.get(i);
追问

能不能通过
String num="";
switch
case 1:

num="One";

break;

........


test.get+num() 这里无法处理

追答

不可以的。你天真了。
java中的getter和setter是预先生成好的，没有你这么用的。

参考技术A 采用java反射机制，遍历这个对象的所有get方法就可以
代码如下:
public class User
private int age;
private String name;
private int sex;
public int getAge()
return age;

public void setAge(int age)
this.age = age;

public String getName()
return name;

public void setName(String name)
this.name = name;


public int getSex()
return sex;

public void setSex(int sex)
this.sex = sex;

User(int age,int sex,String name)
this.age=age;
this.sex=sex;
this.name=name;


public static void main(String[] args)
User u=new User(20, 1, "test");
Class c=u.getClass();
Method[] ms=c.getDeclaredMethods();
for(Method m:ms)
String name=m.getName();
if(name.startsWith("get"))
try
Object r=m.invoke(u, null);
System.out.println(r);
catch (IllegalAccessException e)
e.printStackTrace();
catch (IllegalArgumentException e)
e.printStackTrace();
catch (InvocationTargetException e)
e.printStackTrace();