Im confused about string...

[sukatoa]

1. when we initialize value,

String st = new String("the quick brown fox jump over the lazy dog");

and

String st = "the quick brown fox jump over the lazy dog";

both of them are correct right?

Which of the two could consume greater memory space?

And about comparing strings.

st.equals(another string)

the code executes

if

st.equals(null);

then why we cannot compare it to null? NullPointerExce ption occured,

Since the string could be compare into null...

by

st == null;

Is the method equals in String only accepts "" instead of null?

Is the implementation of equals method is to get the parameter value then count the value's length?

Im getting inspired already,
Sukatoa

[r035198x]

1. when we initialize value,

String st = new String("the quick brown fox jump over the lazy dog");

and

String st = "the quick brown fox jump over the lazy dog";

both of them are correct right?

Which of the two could consume greater memory space?

And about comparing strings.

st.equals(another string)

the code executes

if

st.equals(null);

then why we cannot compare it to null? NullPointerExce ption occured,

Since the string could be compare into null...

by

st == null;

Is the method equals in String only accepts "" instead of null?

Is the implementation of equals method is to get the parameter value then count the value's length?

Im getting inspired already,
Sukatoa

For the first part of your question, see the specs and wiki.

For the second part, here's the implementation of the String.equals method

[CODE=java]public boolean equals(Object anObject) {
if (this == anObject) {
return true;
}
if (anObject instanceof String) {
String anotherString = (String)anObjec t;
int n = count;
if (n == anotherString.c ount) {
char v1[] = value;
char v2[] = anotherString.v alue;
int i = offset;
int j = anotherString.o ffset;
while (n-- != 0) {
if (v1[i++] != v2[j++])
return false;
}
return true;
}
}
return false;
}[/CODE]
Pulled from the Java sources.

[sukatoa]

For the first part of your question, see the specs and wiki.

For the second part, here's the implementation of the String.equals method

[CODE=java]public boolean equals(Object anObject) {
if (this == anObject) {
return true;
}
if (anObject instanceof String) {
String anotherString = (String)anObjec t;
int n = count;
if (n == anotherString.c ount) {
char v1[] = value;
char v2[] = anotherString.v alue;
int i = offset;
int j = anotherString.o ffset;
while (n-- != 0) {
if (v1[i++] != v2[j++])
return false;
}
return true;
}
}
return false;
}[/CODE]
Pulled from the Java sources.

Thanks for the Wiki...

Im on my way,
Sukatoa...