Java笔考试题 共五道题

Java笔试题 共五道题
笔试题
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);
}
}
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);
}
}
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;
? }
}
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;
? }
}
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;
? }
}