public class XXK2 {
private int a;
public XXK2() {a=3;}
public XXK2(int aa) {a=aa;}
public double f1() {
return 2*Math.pow(a,3)+a;
}
public static void main(String[] args) {
XXK2 x=new XXK2(), y=new XXK2(5);
System.out.println(x.f1()+", "+y.f1());
}
}
public class SetTest {
public static void main(String[] args) {
HashSet hs = new HashSet();
boolean b1 = hs.add("a");
hs.add("b");
hs.add("c");
hs.add("d");
hs.add("d");
boolean b2 = hs.add("a");
System.out.println("size="+hs.size());
}
}
现有:
public class Pet()
public class Cat extends Pet{)
执行代码
Cat c- new Cat();
Pet p= (Pet)c;
后下列哪项是正确的?()
以下语句实现的是面向对象的()。
Public Class CustomerInfo
Inherits PersonInfo
图1-1所示的电路中,电流I为( )。
图1-1
图1-4所示的电路中包含( )条支路,用支路电流法分析该电路,需要列写( )个方程。
图1-4
下面程序的输出结果是:
public class Test{
void printValue(int m){
do { System .out .println(“The value is”+m);}
while(- - m>10);
}
public static void main(String arg[]){
int i=10;
Test t= new Test();
t.printValue(i);}}
– Susan, will you please go and empty that drawer?
–
图1-1所示的电路中,电流I为( )。
图1-1
图1-4所示的电路中包含( )条支路,用支路电流法分析该电路,需要列写( )个方程。
图1-4
建设法律关系的变更主要是指协议变更。
public static void main(String[] args) {
int i=1, s=0;
while(true) {
if(i%2==0) s+=i;
if(i++>=10) break;
}
System.out.println("s="+s);
}
public static void main(String[] args) {
int c0=0, c1=0, c2=0;
for(int x=1; x<=20; x++) {
switch(x%3) {
case 0: c0++; break;
case 1: c1++; break;
case 2: c2++; break;
}
}
System.out.println("c0,c1,c2="+c0+","+c1+","+c2);
}
public class XXK2 {
private int a,b;
public XXK2(int aa, int bb) {a=aa; b=bb;}
public int f1(int x) {
if(x>10) return a+b+3*x;
else return a*b*x;
}
public static void main(String[] args) {
XXK2 x=new XXK2(3,4);
int y=x.f1(8);
System.out.println("y="+y);
}
}
abstract class Shape {
int a,b;
public Shape(int aa, int bb) {a=aa; b=bb;}
abstract public double area();
}
class Rectangle extends Shape {
public Rectangle(int aa, int bb) {super(aa,bb);}
public double area() {return a*b;}
}
class Triangle extends Shape {
public Triangle(int aa, int bb) {super(aa,bb);}
public double area() {return a*b/2;}
}
public class XXK3 {
public static void main(String[] args) {
Shape x,y;
x=new Rectangle(10,20);
y=new Triangle(10,15);
System.out.println(x.area()+", "+y.area());
}
}
public class XXK4 {
public static void main(String[] args) {
int []a={2,5,8,10,15,20};
int s=0;
for(int i=0; i<a.length; i++) s+=a[i];
System.out.println("s="+s);
}
}
public class XXK4 {
public static void main(String[] args) {
String []a={"xxk","weirong","xucong","xuxiaohua","baojuan"};
int m=0;
for(int i=0; i<a.length; i++) {
int n=a[i].length();
if(n>m) m=n;
}
System.out.println("m="+m);
}
}
interface Shape {
double area();
double girth();
}
class Rectangle implements Shape {
int a,b;
public Rectangle(int aa, int bb) {a=aa; b=bb;}
public double area() {return a*b;}
public double girth() {return 2*(a+b);}
}
public class XXK3 {
public static void main(String[] args) {
Shape x;
x=new Rectangle(5,8);
System.out.println(x.area()+", "+x.girth());
}
}
Public class Test {
Public static void main(String[] args) {
Vector teamList = new Vector();
teamList.add("Z");
teamList.add("L");
teamList.add("W");
teamList.remove(0);
teamList.remove(0);
System.out.println(teamList.size()+","+teamList.get(0));
}
}
public class XXK4 {
public static void main(String[] args) {
int [][]a={{2,5,8},{3,6,9},{4,5,6}};
int []b=new int[3];
int i,j;
for(i=0; i<a.length; i++)
for(j=0; j<a[i].length; j++)
b[i]+=a[i][j];
for(i=0; i<b.length; i++)
System.out.print(b[i]+" ");
}
}
class ABC {
int a,b;
public ABC(int a, int b) {this.a=a; this.b=b;}
public int compareTo(ABC x) {return a*b-x.a*x.b;}
}
public class XXK5 {
public static void main(String[] args) {
int [][]d={{3,8},{4,6},{5,6},{2,9},{6,7},{5,8}};
ABC []ar=new ABC[d.length];
int i,k=0;
for(i=0; i<ar.length; i++)
ar[i]=new ABC(d[i][0],d[i][1]);
for(i=1; i<ar.length; i++)
if(ar[i].compareTo(ar[k])>0) k=i;
System.out.println("k="+k);
}
}
class ABC {
String name;
double price;
public ABC(String na, double pr) {name=na; price=pr;}
public int compareTo(ABC x) {
if(name.compareTo(x.name)>0) return 1;
if(name.compareTo(x.name)<0) return -1;
else return 0;
}
}
public class XXK5 {
public static void main(String[] args) {
String []s={"apple", "pear", "tangerme", "banana", "grape"};
double []d={3.8, 2.5, 3.2, 4.3, 5.2};
ABC []ar=new ABC[s.length];
int i,k=0;
for(i=0; i<ar.length; i++)
ar[i]=new ABC(s[i],d[i]);
for(i=1; i<ar.length; i++)
if(ar[i].compareTo(ar[k])>0) k=i;
System.out.println(ar[k].name+" "+ar[k].price);
}
}
public class XXK2 {
private final int a;
public XXK2(int a) {this.a=a;}
public int f1(int x) {
if(x%2==1) return 2*(a+x);
else return 3*a+x;
}
public int get() {return a;}
public static void main(String[] args) {
XXK2 x=new XXK2(8);
int y=x.f1(20);
y+=x.get();
System.out.println("y="+y);
}
}
public class XXK2 {
private int a; public XXK2(int aa) {a=aa;}
public int f1(int x) {
if(x%2==1) return 2*(a+x);
else return 3*a+x;
}
public int get() {return a;}
public static void main(String[] args) {
XXK2 x=new XXK2(5);
int y=x.f1(9);
y+=x.get()*x.get();
System.out.println("y="+y);
}
}
public class XXK2 {
private int a;
public XXK2() {a=3;}
public XXK2(int aa) {a=aa;}
public double f1() {
return 2*Math.pow(a,3)+a;
}
public static void main(String[] args) {
XXK2 x=new XXK2(), y=new XXK2(5);
System.out.println(x.f1()+", "+y.f1());
}
}
class Rectangle {
private int a,b;
public Rectangle(int aa, int bb) {a=aa; b=bb;}
public int area() {return a*b;}
public int girth() {return 2*(a+b);}
}
public class XXK3 extends Rectangle {
private int c;
public XXK3(int aa, int bb, int cc) {super(aa,bb); c=cc;}
public int volume() {return area()*c;}
public int arrisLength() {return 2*girth()+4*c;}
public static void main(String[] args) {
XXK3 x=new XXK3(2,3,4);
int y1=x.volume();
int y2=x.arrisLength();
System.out.println(y1+", "+y2);
}
}
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