4.
Scanner scan = new Scanner(System.in); int a,b,c; System.out.println("请输入三个整数"); a= scan.nextInt(); b= scan.nextInt(); c= scan.nextInt(); if (a>b){ int d =a; a=b; b=d; } if (b>c) { int d = b; b = c; c = d; } if (a>b){ int d =a; a=b; b=d; } System.out.println(a+" "+b+" "+c);
5.