java获取对象的私有方法或成员属性并调用

1。获取私有成员

public class PrivateObject {

private String privateString = null;

public PrivateObject(String privateString) {
this.privateString = privateString;
}
}

获取代码：

PrivateObject privateObject = new PrivateObject("The Private Value");

Field privateStringField = PrivateObject.class.
getDeclaredField("privateString");

privateStringField.setAccessible(true);

String fieldValue = (String) privateStringField.get(privateObject);
System.out.println("fieldValue = " + fieldValue);

2。 获取私有方法并调用

public class PrivateObject {

private String privateString = null;

public PrivateObject(String privateString) {
this.privateString = privateString;
}

private String getPrivateString(){
return this.privateString;
}
}

获取并调用代码：

PrivateObject privateObject = new PrivateObject("The Private Value");

Method privateStringMethod = PrivateObject.class.
getDeclaredMethod("getPrivateString", null);

privateStringMethod.setAccessible(true);

String returnValue = (String)
privateStringMethod.invoke(privateObject, null);

System.out.println("returnValue = " + returnValue);

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