Ternary operator, array method and integer comparison code in Java

//class前，导入的java包import java.util.Scanner;

//我只把主方法列出来了
public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // 接收用户输入        
        System.out.println("清输入第1个数：");        
        int a = scanner.nextInt();        
        System.out.println("清输入第2个数：");        
        int b = scanner.nextInt();        
        System.out.println("清输入第3个数：");        
        int c = scanner.nextInt();        
        System.out.println("清输入第4个数：");        
        int d = scanner.nextInt();

        // 三目运算解决        
        int m = a > b ? a : b;
        int n = c > d ? c : d;
        int x = m > n ? m : n;
        System.out.println("max=" + x);

        // 分支方法解决
        int t;        
        if (a > b) {
            t = a;  a = b;  b = t;  
            }        
        if (a > c) {
            t = a;  
            a = c;  
            c = t;  
            }  
         if (a > d) {
             t = a;  
             a = d;  
             d = t;  
             }        
         if (b > c) {
             t = b;  
             b = c;  
             c = t;  
             }        
         if (b > d) {
             t = b;  
             b = d;  
             d = t;  
             }        
         if (c > d) {
             t = c;  
             c = d;  
             d = t;  
             }
        System.out.println("max=" + d);

        // 数组方法解决
        int p[] = new int[4];        
        for (int i = 0; i < 4; i++) {
            System.out.println("请输入第" + (i + 1) + "个数字：");
            p[i] = scanner.nextInt();
        }        
        for (int i = 0; i < 3; i++) {            
        if (p[i] > p[i + 1]) {
                // 这里也可以设置一个中间变量t来进行交换
                p[i] = p[i] + p[i + 1];
                p[i + 1] = p[i] - p[i + 1];
                p[i] = p[i] - p[i - 1];
            }
        }
        System.out.println("max=" + p[3]);// 最大的就放在数组最后了
    }