simple java(十一)---application(11)

用array搵最大.

import javax.swing.

JOptionPane;public class Lab9_1 {

public static void main(String[] args) {

String[] number = new String[5];

int[] num = new int[5];

int tempmax;for(int i=0; i<.number.length; i++){

number[i] =JOptionPane.showInputDialog("Enter number "+i+" : ");

num[i] = Integer.parseInt(number[i]);}

tempmax = num[0];

for(int i=1; i<.num.length; i++)

if (tempmax

tempmax = num[i];

System.out.println("The max value is: " + tempmax);

System.exit(0);}}

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Study the following program which will randomly generate a value between 1 to 20:

public class testRandom {

public static void main(String[] args) {

int x = 1 + (int) (Math.random()*20);

System.out.println(x);}}

Write a program that creates two 5×4 matrixes containing random integers in the range 1-20. Then, the program adds the corresponding elements of the first two matrixes to athird 5×4 matrix.

Matrix 1 is :14 5 20 91

4 5 12 19

14 3 2 4

19 5 17 12

3 3 4 13

Matrix 2 is :1 4 7 8

18 10 3 15

14 9 15 4

1 12 4 4

16 1 6 11

Matrix 3 (= Matrix1 + Matrix 2) is :

15 9 27 17

32 15 15 34

28 12 17 8

20 17 21 16

19 4 10 24

solution:

public class Lab9_4 {

public static void main(String[] args) {

int[][] matrix1 = new int[5][4],

matrix2 = new int[5][4], matrix3 = newint[5][4];

String output="";

for (int row = 0; row <. 5; row++)

for (int column = 0; column <. 4; column++) {

matrix1[row][column] = 1 + (int) (Math.random() * 20);

matrix2[row][column] = 1 + (int) (Math.random() * 20);

matrix3[row][column] = matrix1[row][column]+ matrix2[row][column];}

output += "\nMatrix 1 is :\n";

for (int row = 0; row <. matrix1.length; row++) {

for (int column = 0; column <. matrix1[row].length; column++) {

output += matrix1[row][column] + "\t";}

output += "\n";}

output += "\nMatrix 2 is :\n";

for (int row = 0; row <. matrix2.length; row++) {

for (int column = 0; column <. matrix2[row].length; column++) {

output += matrix2[row][column] + "\t";}

output += "\n";}

output += "\nMatrix 3 (= Matrix1 + Matrix 2) is :\n";

for (int row = 0; row <. matrix3.length; row++) {

for (int column = 0; column <. matrix3[row].length; column++) {

output += matrix3[row][column] + "\t";}

output += "\n";}

System.out.println(output);}}