# <h1>松林Java04筆記2019/11/25

a.二維陣列
public class TwoArrayDemo{
public static void main(String args[]){
int sum=0;
int sale[][]={{32,58,65,70},{43,85,92,65}};
for(int i=0;i<sale.length;i++){
for(int j=0;j<sale[i].length;j++){
sum+=sale[i][j];
System.out.print(sale[i][j]+" ");
}
System.out.println();
}

System.out.println(sum);
}

}

b.函式

public class MethodDemo{

public static void main(String args[]){

star();
System.out.println("Hello");
star();
}

public static void star(){
for(int i=1;i<=20;i++){
System.out.print("*");
}
System.out.println();
}

}

c.NumberMethod
public class NumberMethod{
public static void main(String args[]){
int a=10;
number_add(a);
System.out.println("main a is:"+a);
}

public static void number_add(int a){

a+=10;
System.out.println("number_add a is:"+a);

}
}

d.ReturnMethod
public class ReturnMethod{
public static void main(String args[]){

double num;
num=add_length(7,3);
System.out.println("num="+num);
System.out.println("num="+add_length(7,3));

}
public static double add_length(int m,int n){

return Math.sqrt(m*m+n*n);
}
}

e.ArrayMethod
public class ArrayMethod{

public static void main(String args[]){

int A[][]={{25,,63,94,18,21},{37,45,29,51,92}};
array_add(A);

}
public static void array_add(int A[][]){
for(int i=0;i<A.length;i++){
for(int j=0;j<A[i].length;j++){
System.out.print(A[i][j]+" ");
}
System.out.println();
}
}
}

f.ArrayMethodClass
public class ArrayMethodClass{
public static void main(String args[]){
int B[]={1,2,3,4,5};

aMethod(B);
for(int i=0;i<B.length;i++){

System.out.print("B陣列:"+B[i]+" ");
}
}
public static void aMethod(int A[]){
for(int i=0;i<A.length;i++){
A[i]+=10;
System.out.print("A陣列:"+A[i]+" ");
}
System.out.println();
}

}