转置矩阵以及判断上三角矩阵

public class Matrix { //矩阵类
private int element[][];
public Matrix(int m,int n){
this.element=new int[m][n];
}
public Matrix(int n){this(n,n);}
public Matrix(int m,int n,int mat[][]){
this(m,n);
for(int i=0;i<mat.length;i++){
for(int j=0;j<mat[i].length;j++){
this.element[i][j]=mat[i][j];
}
}
}

public int get(int i,int j){
return this.element[i][j];
}

public void set(int i,int j,int value){
this.element[i][j] = value;
}

public Matrix transpose(){ //将矩阵转换成转置矩阵，返回一个矩阵类的值
String str = "转置矩阵" + "\n";
Matrix temp = new Matrix(this.element[0].length,this.element.length);
for(int i=0;i<temp.element.length;i++){
for(int j=0;j<temp.element[i].length;j++){
temp.element[i][j] = this.element[j][i];
}

}

return temp;
}

public String toString(){
String str = "矩阵 Matrix (" + this.element.length + "*" + this.element[0].length + ") : \n";
for(int i=0;i<this.element.length;i++){
for(int j=0;j<this.element[i].length;j++){
str += String.format("%4d", this.element[i][j]);
}
str += "\n" ;
}
return str;
}

public boolean equals(Matrix a){ //判断是否和另一个矩阵相同
System.out.print("是否和另一个矩阵相同");
for(int i=0;i<this.element.length;i++){
for(int j=0;j<this.element[i].length;j++){
if(this.element[i][j]!=a.element[i][j])
return false;
}
}
return true;
}

public boolean isUpperTriangularMatrix(){ //判断是否为上三角矩阵
for(int i=1;i<this.element.length-1;i++){
for(int j=0;j<this.element[i].length-1;j++){
if(this.element[i][j]==0)
return true;
}
}
return false;
}

public boolean isSymmetricMatrix(){ //判断矩阵是否对称
System.out.print("是否是对称矩阵");
for(int i=0;i<this.element.length;i++){
for(int j=0;j<this.element[i].length;j++)
if(this.element[i][j]!=this.element[j][i])
return false;
}
return true;
}

public static void main(String[] args){ //main方法，程序开始执行
int m1[][] = {{1,2,3},{4,5,6}};
Matrix mata = new Matrix(2,3,m1);
System.out.print(mata.toString());
System.out.print(mata.transpose().toString());
System.out.print(mata.isSymmetricMatrix());
int m2[][] = {{1,2,3},
  {0,5,6},
  {0,0,9}};
Matrix mata1 = new Matrix(3,3,m2);
System.out.print(mata1.toString());
System.out.print(mata1.isUpperTriangularMatrix());
}
}