'Else If' 在 Java 中给出错误“'else'而没有 'if'”
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'Else If' giving the error " 'else' without 'if' " in Java
提问by Rocmalone
I'm tring to do some Java coding with NETBEANS 7.1.2, but it gives me the error " 'else' without 'if' " when I try to build this code:
我正在尝试使用 NETBEANS 7.1.2 进行一些 Java 编码，但是当我尝试构建此代码时，它给了我错误“'else' without 'if'”：
private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String search1;
search1 = jTextField1.getText();
// stone
if (search1=="Stone" || search1=="Rock" || search1=="stone" || search1=="rock" || search1=="1");
{
jTextField2.setText("Stone: 1");
}
// grass
else if (search1=="Grass" || search1=="grass");
{
jTextField2.setText("Grass: 2");
}
}
The problem occurs at the 'else if' under the //grass. Am I doing something wrong?
问题发生在//grass 下的'else if'。难道我做错了什么？
回答by óscar López
In this line:
在这一行：
if (search1=="Stone" || search1=="Rock" || search1=="stone" || search1=="rock" || search1=="1");
And this line:
而这一行：
else if (search1=="Grass" || search1=="grass");
You must remove the ;at the end. Those semicolons are misplaced, the compiler will interpret the first ifstatement as an ifwithout a body, the code between the {}as a block scope and the else ifstatement as an elsewithout an if.
您必须删除;末尾的 。那些分号放错了位置，编译器会将第一条if语句解释为if没有正文，将{}as 块范围和else if语句之间的代码解释为else没有if.
Also, be aware that all the string comparisons are mistaken, in Java you mustuse equals()for comparing two strings for equality, not ==, which compares for identity.
另外，请注意所有字符串比较都是错误的，在 Java 中，您必须使用equals()来比较两个字符串的相等性，而不是==使用身份比较。
回答by Hanon
You have an ";" after the first condition.
你有一个“;” 在第一个条件之后。
The compiler assume this is the end of if statement, therefore the compiler show error at "else if" line. Remove the ";" and it should be fine!
编译器假定这是 if 语句的结尾，因此编译器在“else if”行显示错误。除掉 ”;” 应该没问题！
回答by Irsh Techirsh
I had same problem like what u have. I found this as solution and it worked fine for me. I guess this is what u need.
我有和你一样的问题。我发现这是解决方案，对我来说效果很好。我想这就是你所需要的。
String unit=jTextField1.getText();
if(unit.equals("kg") || unit.equals("gm")){
// some code
}
else if(unit.equals("dzn")||unit.equals("qty")){
// some code
}
