大树

Java-Object通用方法一、Object类package java.lang;public class Object { private static native void registerNatives(); static { registerNatives(); } public native int hashCode(); public boolean equals(Object obj) { return

Java-String一、String 被声明为final，因此它不可被继承。（1）Java 8 中，String 内部使用 char 数组存储数据。public final class String implements java.io.Serializable, Comparable<String>, CharSequence { /** The value is used for character storage. */ private final char

1、基本类型类型大小（bit）值范围数值型byte8-128~127short16-32768~32767int32-2147483648~2147483647long64-9223372036854774808~9223372036854774807浮点型float323.402823e+38 ~ 1.401298e-45double641.797693e+308~ 4.9000000e-324字符型char16\u0000~\uFFFF（unicode编码）布尔型boolean~true/false