526互联

20230531 java.util.Objects

发布时间 2023-08-28 09:53:43作者: 流星<。)#)))≦

介绍

  • java.util.Objects
  • public final class Objects

API

static

  • equals
  • deepEquals
    • 比较数组元素
  • hashCode
  • hash
    • 为一系列输入值生成哈希码
  • toString
    • String toString(Object o)
    • String toString(Object o, String nullDefault)
  • compare
    • <T> int compare(T a, T b, Comparator<? super T> c)

null 判断，抛出 NullPointerException

  • isNull
  • nonNull
  • requireNonNull
    • <T> T requireNonNull(T obj)
    • <T> T requireNonNull(T obj, String message)
    • <T> T requireNonNull(T obj, Supplier<String> messageSupplier)
  • requireNonNullElse
    • <T> T requireNonNullElse(T obj, T defaultObj)
  • requireNonNullElseGet
    • <T> T requireNonNullElseGet(T obj, Supplier<? extends T> supplier)

检查索引越界，抛出 IndexOutOfBoundsException

  • checkIndex
    • int checkIndex(int index, int length)
    • long checkIndex(long index, long length)
  • checkFromToIndex
    • int checkFromToIndex(int fromIndex, int toIndex, int length)
    • long checkFromToIndex(long fromIndex, long toIndex, long length)
  • checkFromIndexSize
    • int checkFromIndexSize(int fromIndex, int size, int length)
    • long checkFromIndexSize(long fromIndex, long size, long length)