答案:import()java.util.Scanner;()class()Shixun1_4(){()public()static()void()main(String[]()args)(){()Scanner()scan()=()new()Scanner(System.in);()int()x1,x2,y1,y2;()double()length;()System.out.println("请输入第一个点的坐标:");()x1()=()scan.nextInt();()y1()=()scan.nextInt();()System.out.println("请输入第二个点的坐标:");()x2()=()scan.nextInt();()y2()=()scan.nextInt();()length()=()Math.sqrt(Math.pow(x1()-()x2,2)() ()Math.pow(y1()-()y2,2));()System.out.println("length()=()"() ()length);()}()}()