利用反射机制将字符中的某个字符换成另一个字符

此例子：将字符为b的换成a：

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public class ReflectChangeValue {public String  str1 = "boll";public String str2 = "basketball";public String str3 = "zchen";@Overridepublic String toString() {return str1+"--"+str2+"--"+str3;}}

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import java.lang.reflect.Field;public class ReflectTest {public static void main(String[] args) throws Exception {ReflectChangeValue rf = new ReflectChangeValue();changeStringValue(rf);System.out.println(rf);    /**String str1 = "abc";Method methodCharAt = String.class.getMethod("charAt", int.class);System.out.println(methodCharAt.invoke(str1, 1));*/}private static void changeStringValue(Object obj) throws Exception{Field[] fields = obj.getClass().getFields();for(Field field:fields){if(field.getType() == String.class){String oldValue = (String)field.get(obj);String newValue = oldValue.replace('b', 'a');field.set(obj, newValue);}}}}