Java 如何比较长值等于长值
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How to Compare a long value is equal to Long value
提问by Chitresh
long a = 1111;
Long b = 1113;
if(a == b)
{
System.out.println("Equals");
}else{
System.out.println("not equals");
}
the above code prints a "equals" in console, which is wrong answer. my qestions is how to compare a long variable value is equals to Long variable value. please replay me as soon as possible.
上面的代码在控制台中打印了一个“equals”，这是错误的答案。我的问题是如何比较 long 变量值是否等于 Long 变量值。请尽快重播我。
Thankh you
谢谢你
采纳答案by AlexR
First your code is not compiled. Line Long b = 1113;
首先你的代码没有被编译。线长 b = 1113;
is wrong. You have to say
是错的。你不得不说
Long b = 1113L;
Second when I fixed this compilation problem the code printed "not equals".
其次，当我解决这个编译问题时，代码打印出“不等于”。
回答by Jigar Joshi
It works as expected,
它按预期工作，
Try checking IdeOneDemo
尝试检查IdeOneDemo
public static void main(String[] args) {
long a = 1111;
Long b = 1113l;
if (a == b) {
System.out.println("Equals");
} else {
System.out.println("not equals");
}
}
prints
印刷
not equalsfor me
not equals为了我
Use compareTo()to compare Long, ==wil not work in all case as far as the value is cached
使用compareTo()比较长，==西港岛线在所有情况下，没有工作就值缓存
回答by barti_ddu
long a = 1111;
Long b = new Long(1113);
System.out.println(b.equals(a) ? "equal" : "different");
System.out.println((long) b == a ? "equal" : "different");
回答by Mr_CRivera
On the one hand Long is an object, while on the other hand long is a primitive type. In order to compare them you could get the primitive type out of the Long type:
一方面 Long 是一个对象，另一方面 long 是一个原始类型。为了比较它们，您可以从 Long 类型中获取原始类型：
public static void main(String[] args) {
long a = 1111;
Long b = 1113;
if ((b!=null)&&
(a == b.longValue()))
{
System.out.println("Equals");
}
else
{
System.out.println("not equals");
}
}
回答by Justas
Since Java 7 you can use java.util.Objects.equals(Object a, Object b):
从 Java 7 开始，您可以使用java.util.Objects.equals(Object a, Object b)：
These utilities include null-safe or null-tolerant methods
这些实用程序包括空安全或空值容忍方法
Long id1 = null;
Long id2 = 0l;
Objects.equals(id1, id2));
回答by ArifMustafa
I will share that How do I do it since Java 7 -
我将分享自 Java 7 以来我该怎么做 -
Long first = 12345L, second = 123L;
System.out.println(first.equals(second));
output returned : false
输出返回：false
and second example of match is -
匹配的第二个例子是 -
Long first = 12345L, second = 12345L;
System.out.println(first.equals(second));
output returned : true
输出返回：true
So, I believe in equals method for comparing Object's value, Hope it helps you, thanks.
所以，我相信比较 Object 值的 equals 方法，希望对你有帮助，谢谢。
回答by Nabin Kumar Khatiwada
public static void main(String[] args) {
long a = 1111;
Long b = 1113L;
if(a == b.longValue())
{
System.out.println("Equals");
}else{
System.out.println("not equals");
}
}
or:
public static void main(String[] args) {
long a = 1111;
Long b = 1113L;
if(a == b)
{
System.out.println("Equals");
}else{
System.out.println("not equals");
}
}
