Java 中是否有關鍵字，類似於 Python 的“is”？

Question

Java中有沒有像'is'這樣的東西？ 根據內存位置評估為真的東西？

a = 1
b = a
print(id(a))
print(id(b))

# if a is b condition will evaluate to true
# the above print statement gives the same memory ID. In my case: 14374435888

# above assignment b = a is not the same as below
a = 1
b = 1

Answer 1

假設你有三個字符串：

String a = "first";
String b = "second";
String c = a;

// false, because they're in different memory locations
System.out.println(a == b);

// true, because they point to the same location in memory
System.out.println(a == c);