javaisupper的简单介绍

博主：adminadmin 2023-01-14 14:36:09 366

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用java声明Matrix类表示矩阵，使用二维数组存储矩阵元素，实现以下方法：

public class Matrix {

private static String matrix_A;

private int mx[][], m, n;

public Matrix(int r, int c) {

m = r;

n = c;

mx = new int[m][n];

iniMatrix();

}

public Matrix() {

m = 3;

n = 3;

mx = new int[3][3];

iniMatrix();

}

public void iniMatrix()// 随机取数

{

int i, j;

for (i = 0; i = m - 1; i++)

for (j = 0; j = n - 1; j++)

mx[i][j] = (int) (Math.random() * 100);

}

public void tranMatrix()// 转置矩阵

{

int i, j, t;

int mt[][] = new int[m][n];

for (i = 0; i = m - 1; i++)

for (j = 0; j = n - 1; j++)

mt[i][j] = mx[i][j];

t = m;

m = n;

n = t;

mx = new int[m][n];

for (i = 0; i = m - 1; i++)

for (j = 0; j = n - 1; j++)

mx[i][j] = mt[j][i];

}

public void printMatrix()// 输出矩阵所有值

{

int i, j;

for (i = 0; i = m - 1; i++) {

for (j = 0; j = n - 1; j++)

System.out.print(" " + mx[i][j]);

System.out.println();

}

}

//判断一个矩阵是否为上三角矩阵

public boolean isUpperTriangularMatrix() {

int i, j = 0;

int c = this.mx[1][0];

for(i=1; ithis.mx.length; i++)

for(j=0; ji; j++)

if(this.mx[i][j] != c)

break;

if(i=this.mx.length)

return true;

return false;

}

public void addMatrix(Matrix b)// 矩阵相加

{

int i, j;

for (i = 0; i = m - 1; i++)

for (j = 0; j = n - 1; j++)

mx[i][j] = mx[i][j] + b.mx[i][j];

}

public static void main(String args[]) {

Matrix ma = new Matrix(4, 3);

Matrix mb = new Matrix(4, 3);

System.out.println("The matrix_A:");

ma.printMatrix();

System.out.println("The matrix_B:");

mb.printMatrix();

if(ma.isUpperTriangularMatrix())

System.out.println("上三角矩阵：\n" + ma.isUpperTriangularMatrix());

System.out.println("Matrix_A + Matrix_B:");

ma.addMatrix(mb);

ma.printMatrix();

System.out.println("Transpose Matrix_A:");

mb.tranMatrix();

mb.printMatrix();

System.out.println("Transpose Matrix_A+Matrix_B:");

mb.tranMatrix();

mb.printMatrix();

}

}

从键盘输入一个字符,如果是大写字母,则转成小写字母,如果是小写字母则转成大写字母,其他字符原样输出

java语言来实现

1、创建一个Scanner对象来处理用户的输入

2、从scanner中获取用户输入的字符char

3、判断字符char是大写('A' = c c = 'Z'),则将字符的ascii值加32则变成小写

4、判断字符char是小写('a' = c c = 'z'),则将字符的ascii值减32则变成大写

5、其他不满足范围的则原样输出即可。

示例：

//循环接收输入

while(true){

    Scanner scanner = new Scanner(System.in);

    String value = scanner.next();//获取输入值

    if(value != null  value.length() == 1){

    char c = value.toCharArray()[0];

    if('A' = c  c = 'Z'){//字符比较，实际上是ascii值比较

        c = (char) ((int)c + 32);

    }else if('a' = c  c = 'z'){

        c = (char) ((int)c - 32);

    }

     System.out.println(c);

    }

}

java实现矩阵相加、相乘，判断是否上（下）三角矩阵、对称矩阵、相等的算法

class Matrix

{

private int value[][]; //存储矩阵元素的二维数组

public Matrix(int m, int n) //构造m行n列的空矩阵

{

this.value=new int[m][n];

}

public Matrix(int n) //构造n行n列的空矩阵

{

this(n,n);

}

public Matrix()

{

this(10,10);

}

public Matrix(int mat[][]) //构造矩阵，由数组mat提供矩阵元素

{

this(mat.length,mat[0].length);

for (int i=0; imat.length; i++)

for (int j=0; jmat[i].length; j++)

this.value[i][j] = mat[i][j];

}

public int get(int i, int j) //获得矩阵第i行第j列的元素，O(1)

{

return value[i][j];

}

public void set(int i, int j, int k) //设置矩阵第i行第j列的元素，O(1)

{

value[i][j]=k;

}

public void add(Matrix b) //this和b两个矩阵相加，改变当前矩阵

{

for (int i=0; ithis.value.length; i++)

for (int j=0; jthis.value[i].length; j++)

this.value[i][j] += b.value[i][j];

}

public String toString() //行主序遍历，访问矩阵全部元素

{

String str="";

for (int i=0; ivalue.length; i++)

{

for (int j=0; jvalue[i].length; j++)

str += " "+value[i][j];

str += "\n";

}

return str;

}

public Matrix transpose() //矩阵的转置

{

Matrix trans = new Matrix(value[0].length, value.length);

for (int i=0; ithis.value.length; i++)

for (int j=0; jthis.value[i].length; j++)

trans.value[j][i]=this.value[i][j];

return trans;

}

//判断一个矩阵是否为上三角矩阵

public boolean isUpperTriangularMatrix() {

int i, j = 0;

int c = this.value[1][0];

for(i=1; ithis.value.length; i++)

for(j=0; ji; j++)

if(this.value[i][j] != c)

break;

if(i=this.value.length)

return true;

return false;

}

//判断一个矩阵是否为下三角矩阵

public boolean isLowerTriangularMatrix() {

int i, j = 0;

int c = this.value[0][1];

for(i=0; ithis.value.length-1; i++)

for(j=i+1; jthis.value[0].length; j++)

if(this.value[i][j] != c)

break;

if(i=this.value.length-1)

return true;

return false;

}

//判断一个矩阵是否为对称矩阵

public boolean isSymmetricMatrix () {

int i, j = 0;

for(i=1; ithis.value.length; i++)

for(j=0; ji; j++)

if(this.value[i][j] != this.value[j][i])

break;

if(i=this.value.length)

return true;

return false;

}

//比较两个矩阵是否相等

public boolean equals(Matrix b) {

int i, j = 0;

if(this.value.length != b.value.length || this.value[0].length != b.value[0].length)

return false;

for(i=0; ithis.value.length; i++)

for(j=0; jthis.value[0].length; j++)

if(this.value[i][j] != b.value[j][i])

break;

if(i=this.value.length)

return true;

return false;

}

//计算两个矩阵的乘积

public Matrix multiply(Matrix b){

int i, j, k;

int sum;

Matrix mtr;

if(this.value[0].length != b.value.length) {

return null;

}

mtr = new Matrix(this.value.length, b.value[0].length);

for(i=0; ithis.value.length; i++)

{

for(k=0; kb.value[0].length; k++){

for(sum=0,j=0; jthis.value[0].length; j++){

sum += this.value[i][j] * b.value[j][k];

mtr.value[i][k] = sum;

}

}

}

return mtr;

}

}

public class Test

{

public static void main(String args[])

{

int m1[][]={{1,2,3},{4,5,6}};

Matrix a=new Matrix(m1);

int m2[][]={{1,0,0},{0,1,0}};

Matrix b=new Matrix(m2);

System.out.print("Matrix a:\n"+a.toString());

System.out.print("Matrix b:\n"+b.toString());

a.add(b);

System.out.print("Matrix a:\n"+a.toString());

System.out.println("a的转置矩阵：\n"+a.transpose().toString());

int m3[][] = {{1,2,1},{0,3,1},{0,0,2}};

int m4[][] = {{1,0,0},{2,1,0},{3,2,1}};

int m5[][] = {{1,0,2},{0,1,0},{2,0,2}};

Matrix mtr1 = new Matrix(m3);

Matrix mtr2 = new Matrix(m4);

Matrix mtr3 = new Matrix(m5);

if(mtr1.isUpperTriangularMatrix())

System.out.println("上三角矩阵：\n" + mtr1.toString());

if(mtr2.isLowerTriangularMatrix())

System.out.println("下三角矩阵：\n" + mtr2.toString());

if(mtr3.isSymmetricMatrix())

System.out.println("对称矩阵：\n" + mtr3.toString());

System.out.println(mtr1.toString() + "\n乘以\n" + mtr2.toString() + "\n=\n");

Matrix tempM = mtr1.multiply(mtr2);

System.out.println(tempM.toString());

}

}

如何判断一串字符是否为大写字母

// 根据java已经提供的判断大小写的方法

public static boolean isUpper(String word)

{

for(int i = 0; i word.length(); i++)

{

char c = word.charAt(i);

if (!Character.isUpperCase(c))

{

return false;

}

}

return true;

}

public static void main(String[] args) {

System.out.println(isUpper("AB"));

}

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