package com.day2;

import java.lang.reflect.Field;

public class T4_ReflectReplaceString {
    public static void main(String[] args) {
        Demo demo1 = new Demo();
        try {
            //調用該方法
            reflectReplaceString(demo1);
            System.out.println(demo1);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    
 
/**
     * 通過反射替換字符串的所有b
     * 
     * @param demo
     *            該對象
     */
    public static void reflectReplaceString(Demo demo) throws Exception {
        // 1.得到該對象的類對象
        Class c = demo.getClass();
        // 2.獲取所有屬性對象（包括私有屬性）
        Field[] fields = c.getDeclaredFields();
        // 3.遍歷
        for
 
 (Field field : fields) {
            // 4.設置可以訪問私有屬性
            field.setAccessible(true);
            // 5.獲取demo的屬性值
            String oldVal = (String) field.get(demo);
            // 6.替換所有b字符為a字符
            String newVal = oldVal.replace("b", "a");
            // 7.設置demo的屬性值為newVal
            field.set(demo, newVal);
        }

    }
}
 

Demo.java

package com.day2;

public class Demo {
    private String name = "abcdefg";
    private String sex = "boy";
    private String wife = "Bob";

    @Override
    public String toString() {
        return "Demo [name=" + name + ", sex=" + sex + ", wife=" + wife + "]";
    }

}

控制臺輸出：

　　Demo [name=aacdefg, sex=aoy, wife=Boa]

反射_4.案例：使用反射替換對象所有字符串值