1：
package text1;
public class zhangjun {
public static void main(String[] args) {
avg10();
}
public static void avg10() {
int[] array = {89, 89, 92, 94, 78, 91, 88, 92, 90, 90};
int index = 0, sum = 0, temp = 0, avg = 0 ;
//找到最低分 冒泡排除，从小到大排列
for (int i = 0; i < array.length - 1; i++) {
for (int j = i + 1; j < array.length; j++) {
if (array[j] < array[i]) { //如果是大于号， 将是从大到小
temp = array[i];
array[i] = array[j];
array[j] = temp;
}
}
}
//求和
while (array.length != index) {
sum += array[index];
index++;
}
do {
sum = sum - array[0] - array[array.length-1]; //去掉最高分和最低分，
} while (false);
avg = sum / 8;
System.out.println(avg);
}
}
2：
package text1;
import java.util.Random;
public class zhangjun {
public static void main(String[] args) {
Random r = new Random();
int [] [] num = new int [4] [4];
for(int n=0;n<4;n++){
for(int m=0;m<4;m++){
num[n][m]=r.nextInt(9);
}
}
printN(num);
//检验数组第一个数的大小
//第一轮把最大的数排在最下
//第二轮把第二大的排在第三
//第三轮把第三大的排在第二并且把最小的放在前面
for(int n=0;n<3;n++){
for(int m=0;m<3;m++){
if(num[m][0]>num[m+1][0]){
int [] temp= new int [4];
for(int a=0;a<4;a++){
temp[a]=num[m+1][a];
}
for(int a=0;a<4;a++){
num[m+1][a]=num[m][a];
}
for(int a=0;a<4;a++){
num[m][a]=temp[a];
}
}
}
System.out.print("\nround"+(n+1)+"\n");
printN(num);
}
System.out.print("\nfinal result:\n");
printN(num);
}
//数组打印方法
public static void printN(int [] [] a){
for(int n=0;n<4;n++){
for(int m=0;m<4;m++){
System.out.print(a[n][m]+" ");
}
System.out.println();
}
}
}
3：
package text1;
import java.io.IOException;
import java.util.*;
public class zhangjun {
public static void main(String[] args) throws IOException{
Scanner scanner = new Scanner(System.in);
//随机生成7个不重复的数
int[] r = new int[7];
boolean[] b = new boolean[31]; //记录该数是否已经生成
for(int i = 0;i < 7; i ++){
int tem = (int)(Math.random() * 30) + 1;
while(b[tem] == true)
tem = (int)(Math.random() * 30) + 1;
r[i] = tem;
b[tem] = true;
}
//输入7个数
int[] in = new int[7];
for(int i = 0;i < 7;i ++){
in[i] = scanner.nextInt();
}
//打印生成的7个随机数
System.out.println("Random numbers:");
for(int i = 0;i < 7; i ++){
System.out.print(r[i] + " ");
}
System.out.println();
//打印你输入的7个数
System.out.println("Your numbers:");
for(int i = 0;i < 7;i ++){
System.out.print(in[i] + " ");
}
System.out.println();
//打印相同的数
System.out.println("The same numbers:");
for(int i = 0;i < 7;i ++)
for(int j = 0;j < 7;j ++){
if(in[i] == r[j]){
System.out.print(in[i] + " ");
}
}
System.out.println();
}
}
4：
package text1;
public class zhangjun {
public static void main(String[] args) {
// TODO Auto-generated method stub
int max = 0;
int min = 99;
int m = 0;//记录偶数出现的次数
int n = 0;//记录奇数出现的次数
int array[] = { 12, 66, 3, 9, 21, 25, 99, 37, 11, 2 };
for (int i = 0; i < array.length; i++) {
if (array[i] > max) {
max = array[i];
}
if (array[i] <min) {
min = array[i];
}
}
for(int i = 0; i < array.length; i++){
if(array[i]%2==0){
m++;
}else{
n++;
}
}
System.out.println("偶数出现的次数："+m);
System.out.println("奇数出现的次数："+n);
System.out.println("最大值："+max);
System.out.println("最大值："+min);
}
}
