java 参数传递
来源:互联网 发布:电视台直播软件 编辑:程序博客网 时间:2024/05/21 10:59
转载自:http://blog.sina.com.cn/s/blog_4b622a8e0100c1bo.html
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public
class
Test1 {
public
static
void
main(String[] args) {
int
n =
3
;
System.out.println(
"Before change, n = "
+ n);
changeData(n);
System.out.println(
"After changeData(n), n = "
+ n);
}
public
static
void
changeData(
int
nn) {
n =
10
;
}
}
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public
class
Test2 {
public
static
void
main(String[] args) {
StringBuffer sb =
new
StringBuffer(
"Hello "
);
System.out.println(
"Before change, sb = "
+ sb);
changeData(sb);
System.out.println(
"After changeData(n), sb = "
+ sb);
}
public
static
void
changeData(StringBuffer strBuf) {
strBuf.append(
"World!"
);
}
}
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public
class
Test3 {
public
static
void
main(String[] args) {
StringBuffer sb =
new
StringBuffer(
"Hello "
);
System.out.println(
"Before change, sb = "
+ sb);
changeData(sb);
System.out.println(
"After changeData(n), sb = "
+ sb);
}
public
static
void
changeData(StringBuffer strBuf) {
strBuf =
new
StringBuffer(
"Hi "
);
strBuf.append(
"World!"
);
}
}
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public
class
Test4 {
public
static
void
main(String[] args) {
StringBuffer sb =
new
StringBuffer(
"Hello "
);
System.out.println(
"Before change, sb = "
+ sb);
changeData(sb);
System.out.println(
"After changeData(n), sb = "
+ sb);
}
public
static
void
changeData(StringBuffer strBuf) {
StringBuffer sb2 =
new
StringBuffer(
"Hi "
);
strBuf = sb2;
sb2.append(
"World!"
);
}
}
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