【JavaGuide学习笔记】Day.3

简介: 【JavaGuide学习笔记】

JAVA基础常见面试题(中)

1.面向对象和面向过程的区别

2.对象的实体与对象的引用有何不同?

3.对象相等和引用相等的区别

4.构造方法有哪些特点?是否可被override?

5.面向对象的三大特征

6.接口和抽象类有什么共同点和区别?

7.深拷贝和浅拷贝区别了解吗?什么是引用拷贝?

8.==和 equals() 的区别?

9.hashCode() 和 equals()

10.String、StringBuffer、StringBuilder

11.String 为什么是不可变的?

12.字符串拼接用“+” 还是 StringBuilder?

13.String#equals() 和 Object#equals() 有何区别?

14.字符串常量池的作用了解吗?

15.String s1 = new String("abc");这句话创建了几个字符串对象?

16.String#intern 方法有什么作用?

new String 对象的方式 一定会在堆创建一个新的对象。若采用 = " "; 的方式会从常量池中引用

17.String 类型的变量和常量做“+”运算时发生了什么?

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