一。
package com.sykjxy.jsj;
public class hello {
public static void main(String[] args) {
System.out.println();
int x[]= {1,5,7,3,2,9,4};
paixu(x);
for(int i=0;i<x.length;i++) {
System.out.println(x[i]);
}
}
public static void paixu(int a[]) {
for(int i=0;i<a.length-1;i++) {
for (int j=0;j<a.length-1-i;j++) {
if(a[j]>a[j+1]) {
int temp=a[j];
a[j]=a[j+1];
a[j+1]=temp;
}
}
}
}
}
二。
package com.sykjxy.jsj;
public class hello {
public static void main(String[] args) {
int sum1=jc(5);
System.out.println(sum1);
}
public static int jc(int n) {
int sum=1;
for(int i=1;i<=n;i++) {
sum*=i;
}
return sum;
}
}
三。
package com.sykjxy.jsj;
import java.util.Scanner;
public class hello {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("输入年份：");
int year = input.nextInt();
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
System.out.println(year + "是闰年");
} else {
System.out.println(year + "是平年");
}
}
}
四。
package com.sykjxy.jsj;
import java.util.Scanner;
public class hello {
public double getArea(double r) {
double mj=0;
mj=3.14*r*r;
return mj;
}
// 求矩形面积的方法
public double getArea(double a,double b) {
return a*b;
}
}
package com.sykjxy.jsj;
public class hi {
public static void main(String[] args) {
// TODO Auto-generated method stub
hello m=new hello();
System.out.println("圆的面积为:"+m.getArea(10));
System.out.println("矩形的面积为:"+m.getArea(5.5, 10));
}
}
五。
package com.sykjxy.jsj;
public class hello {
public static void main(String[] ards) {
hi b1 = new hi('黑', 2000);
hi b2 = new hi('白', 2500);
System.out.println(b1.toString());
System.out.println(b2.toString());
hi b3 = new hi();
b3.setColor('红');
b3.setCpu(3000);
System.out.println(b3.toString());
}
}
package com.sykjxy.jsj;
public class hi {
private char color;
private int cpu;
public hi(char color, int cpu) {
super();
this.color = color;
this.cpu = cpu;
}
public hi() {
}
public char getColor() {
return color;
}
public void setColor(char color) {
this.color = color;
}
public int getCpu() {
return cpu;
}
public void setCpu(int cpu) {
this.cpu = cpu;
}
@Override
public String toString() {
return "笔记本的信息 [颜色为" + color + ", cpu为" + cpu + "]";
}
}
