传递一个String数组作为参数 [英] passing a String array as argument
问题描述
一个String数组可以声明，并以下列方式初始化：
A String array can be declared and initialized in the following way:
String[] str = {"A", "B"};
但它接受一个String数组作为参数的方法，为什么不能同样在那里使用？
but for a method which accepts a String array as argument, why can't the same be used there?
例如：如果在code以下，我调用替换显示（）从显示（STR）; 到秀（{AB}）; ，它显示编译错误。为什么呢？
For example: if in the code below, i replace the call to show() from show(str); to show({"A" "B"});, it shows complier error. Why?
public class StringArray {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String[] str = {"A", "B"};
show(str);
}
static void show(String[] s) {
System.out.println(s[0] + s[1]);
}
}
所列的编译错误是：
The compiler errors shown are:
StringArray.java:9: illegal start of expression
show({"A", "B"});
^
StringArray.java:9: ';' expected
show({"A", "B"});
^
StringArray.java:9: illegal start of expression
show({"A", "B"});
^
StringArray.java:9: ';' expected
show({"A", "B"});
^
StringArray.java:9: illegal start of type
show({"A", "B"});
^
StringArray.java:11: class, interface, or enum expected
static void show(String[] s) {
^
StringArray.java:13: class, interface, or enum expected
}
^
7 errors
此外使用显示（新的String [] {A，B}）; 是允许的。如何为新的String [] {A，B} 从不同的 {A，B} 路过他们时的方法参数？
thanx提前！
Also using show(new String[] {"A", "B"}); is allowed. How is new String[]{"A", "B"} different from {"A", "B"} when passing them as method arguments?
Thanx in advance!
推荐答案
语法 {A，B} （不包括新的String [] 在它前面）只能用作数组初始化前pression。在其他情况下（包括方法调用），你需要使用新运营商。
The syntax {"A", "B"} (without new String[] in front of it) can only be used as an array initializer expression. In all other contexts (including method calls), you need to use the new operator.
查看阵列的 Java教程获取更多信息。
See the Java Tutorial on Arrays for more info.
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