(1)创建两个Class:
ReflectTest类如下:
package cn.itcast.day01; import java.lang.reflect.Constructor; import java.lang.reflect.Field; public class ReflectTest { public static void main(String[] args) throws Exception { changeStringValue(pt1); System.out.println(pt1); } private static void changeStringValue(Object obj) throws Exception{ Field[] fields = obj.getClass().getFields(); for(Field field :fields){ //if(field.getType().equals(String.class)){ if(field.getType() == String.class){ //同一个字节码用等号 而不是用equal String oldValue = (String) field.get(obj); String newValue = oldValue.replace('b','a'); field.set(obj, newValue); } } } }
ReflectPoint类如下:
package cn.itcast.day01; public class ReflectPoint { public String str1 = "ball"; public String str2 = "basketball"; public String str3 = "itcast"; public ReflectPoint(int x, int y) { super(); this.x = x; this.y = y; } public String toString(){ return str1+":"+str2+":"+str3; } public static void main(String[] args) { // TODO Auto-generated method stub } }
结果为:aall:aasketaall:itcast
Java在利用反射条件下替换英文字母中的值
时间: 2024-10-14 00:49:35