各位大哥,小弟刚学JAVA谁能给我讲讲这些题,越详细越好!
1、写出输出
public class Jtest{
int m=1;
int i=3;
void Jtest(){
m=2;
i=4;
}
public static void main(String[] args){
Jtest app=new Jtest();
System.out.println(app.m+","+app.i);
}
}
1,3
2、 写出输出
public class Jtest{
int m=1;
int i=3;
Jtest(){
m=2;
i=4;
}
public static void main(String[] args){
Jtest app=new Jtest();
System.out.println(app.m+","+app.i);
}
}
2,4
传实参:
3、public class Test {
public static void main(String[] args) {
int a=99;
oper(a);
System.out.print(a);
}
static void oper(int b){
b=b+100;
}
}
99
4、 写出输出
public class Test {
public static void main(String[] args) {
String a=new String("A");
String b=new String("B");
oper(a,b);
System.out.print(a+","+b);
}
static void oper(String c,String d){
c.concat("B");
d=c;
}
}
A,B
5、写出输出
public class Test {
public static void main(String[] args) {
StringBuffer a=new StringBuffer ("A");
StringBuffer b=new StringBuffer ("B");
oper(a,b);
System.out.print(a+","+b);
}
static void oper(StringBuffer c,StringBuffer d){
c.append("B");
d=c;
}
}
AB,B
1、写出输出
public class Jtest{
int m=1;
int i=3;
void Jtest(){
m=2;
i=4;
}
public static void main(String[] args){
Jtest app=new Jtest();
System.out.println(app.m+","+app.i);
}
}
1,3
2、 写出输出
public class Jtest{
int m=1;
int i=3;
Jtest(){
m=2;
i=4;
}
public static void main(String[] args){
Jtest app=new Jtest();
System.out.println(app.m+","+app.i);
}
}
2,4
传实参:
3、public class Test {
public static void main(String[] args) {
int a=99;
oper(a);
System.out.print(a);
}
static void oper(int b){
b=b+100;
}
}
99
4、 写出输出
public class Test {
public static void main(String[] args) {
String a=new String("A");
String b=new String("B");
oper(a,b);
System.out.print(a+","+b);
}
static void oper(String c,String d){
c.concat("B");
d=c;
}
}
A,B
5、写出输出
public class Test {
public static void main(String[] args) {
StringBuffer a=new StringBuffer ("A");
StringBuffer b=new StringBuffer ("B");
oper(a,b);
System.out.print(a+","+b);
}
static void oper(StringBuffer c,StringBuffer d){
c.append("B");
d=c;
}
}
AB,B
不过对你理解Java语言有好处~~
这些都是因为Java没有指针的缘故
里面用的是引用什么的~
LZ等待其他高手回答吧!
我不想抢分了~