1.
public class Hello{
public static void main(String[] args){
System.out.println("Say Hello!");
}
}
2.
public class MathTest{
public static void main(String[] args){
exchange(123,321);
}
public static void exchange(int a,int b){
a-=b;
b+=a;
a=b-a;
System.out.println(a+","+b);
}
}
3.
public class Sort{
public static void main(String[] args){
int[] a=new int[]{13,12,45,1,98,5,31};
for(int i=0;i<a.length-1;i++){
for(int j=a.length-2;j>=i;j--){
if(a[j]>a[j+1]){
int temp=a[j];
a[j]=a[j+1];
a[j+1]=temp;
}
}
}
for(int i=0;i<a.length;i++){
System.out.print(a[i]+" ");
}
System.out.println();
}
}
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