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来源: 互联网 发布时间：2015-05-20
本文导语: Which is the earliest line in the following code after which the object created on the line marked (0) will be a candidate for being garbage collected, assuming no compiler optimizations are done? public class Q76a9 { static String f() { St...
Which is the earliest line in the following code after which the object created on the line marked (0) will be a candidate for being garbage collected, assuming no compiler optimizations are done?
public class Q76a9 {
static String f() {
String a = "hello";
String b = "bye"; // (0)
String c = b + "!"; // (1)
String d = b;
b = a; // (2)
d = a; // (3)
return c; // (4)
}
public static void main(String args[]) {
String msg = f();
System.out.println(msg); // (5)
}
}
1) The line marked (1).
2) The line marked (2).
3) The line marked (3).
4) The line marked (4).
5) The line marked (5).
public class Q76a9 {
static String f() {
String a = "hello";
String b = "bye"; // (0)
String c = b + "!"; // (1)
String d = b;
b = a; // (2)
d = a; // (3)
return c; // (4)
}
public static void main(String args[]) {
String msg = f();
System.out.println(msg); // (5)
}
}
1) The line marked (1).
2) The line marked (2).
3) The line marked (3).
4) The line marked (4).
5) The line marked (5).
|
String d = b;
d先引用了b.
应该是3.
d先引用了b.
应该是3.
|
String d = b;
d先引用了b.
应该是3.
d先引用了b.
应该是3.
|
3
|
2)
指针指向a的时候
指针指向a的时候
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