转换为字符串的整数无法按预期工作

Question

将 str() 与我期望的字符串形式进行比较时出现问题

代码：

int i = 2;
String r = str(i);
println(r);
if (r == "2") {
  println("String works");
} else println("String doesnt work");
if (i == 2) {
  println("Integer works");
} else println("Integer doesnt work");

打印：

2
String doesnt work
Integer works

第二个 if 语句是第一个的复制粘贴，只更改了变量和值，所以我的 if 语句没有任何问题

处理文档状态（关于 str()）：

Converts a value of a primitive data type (boolean, byte, char, int, or float) to its String representation. For example, converting an integer with str(3) will return the String value of "3", converting a float with str(-12.6) will return "-12.6", and converting a boolean with str(true) will return "true".

也不适用于 str(2) == "2" 或 str(i) == "2"

我该如何解决这个问题并使其正常工作（不将其转换回整数，因为那样会使我的代码有点难看）

Answer 1

您不应使用 == 比较 String 值。请改用 equals() 函数：

if (r.equals("2")) {

来自the reference：

To compare the contents of two Strings, use the equals() method, as in if (a.equals(b)), instead of if (a == b). A String is an Object, so comparing them with the == operator only compares whether both Strings are stored in the same memory location. Using the equals() method will ensure that the actual contents are compared. (The troubleshooting reference has a longer explanation.)

更多信息在这里：How do I compare strings in Java?

转换为字符串的整数无法按预期工作

Integers converted to strings do not work as expected

processing