merge and sort 2 arrays

class Main {
    public static void main(String[] args) {
        Main mammoth = new Main();
        System.out.println("Hello World!");
        int[] a = {0,3,4,31};
        int[] b = {4,6,30};
        mammoth.mergearray(a,b);
    }
    public void mergearray(int a[], int b[] )
    { int temp=0;
        int[] c = new int[20];
        
        for(int i=0;i<a.length;i++)
        {
            c[i]=a[i];
        }
        int r = a.length;
        for(int t = 0;t<b.length;t++){
            c[r]=b[t];
            r++;
            if(t==b.length-1){
                break;
            }
        }
        int lenner = a.length + b.length;
        
        for(int x=0;x<lenner-1;x++)
        {
            for(int y =x+1 ; y<lenner;y++){
                {
                    if(c[x]>c[y]){
                        temp = c[x];
                        c[x]=c[y];
                        c[y]=temp;
                    }
                }
            }
          
        }
        for(int apple =0; apple<lenner;apple++){
          System.out.print(" "+c[apple]);
    }
}
}