1.default
2.private
3.protected
4.public
1.default
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只能是同一个package的类，可以访问类中的方法，下面的Addition.java中addTwoNumbers
修改成public 之后，就不会出现编译错误。
public int addTwoNumbers(int a, int b) {
return a + b;
}
下面是没有修改的代码，会编译错误
Addition.java
package package001;
public class Addition {
int addTwoNumbers(int a, int b) {
return a + b;
}
}
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Test.java
package package002;
import package001.*;
public class Test {
public static void main(String[] args) {
Addition obj=new Addition();
obj.addTwoNumbers(10,21);
}
}
修改之后Addition.java
package package001;
public class Addition {
public int addTwoNumbers(int a, int b) {
return a + b;
}
}
Test.java编译成功了。
package package002;
import package001.*;
public class Test {
public static void main(String[] args) {
Addition obj=new Addition();
obj.addTwoNumbers(10,21);
}
}