一、比较大小

public class Test {

public static void main(String[] args) {
    //int sore[] = {88,6,8,98};
    int [] sore = new int[4];
    sore[0] = 88;
    sore[1] = 6;
    sore[2] = 8;
    sore[3] = 98;

    int max;
    int min;
    int i;
    max = min = sore[0];
    for(i=1; i<4; i++){
        if(max < sore[i]){
            max = sore[i];
        }
        if(min > sore[i]){
            min = sore[i];
        }
    }
    System.out.println("max=" + max + ",min=" + min);
}

}

二、计算加减乘除

public class Test {

static int add(int a, int b){
    return a+b;
}
int min(int a, int b){
    return a-b;
}
int mul(int a, int b){
    return a*b;
}
double div(int a,int b){
    return (double)a/b;
}
public static void main(String[] args) {
    Test t = new Test();
    int a = 12;
    int b = 5;
    int add,min,mul = 1;
    double div = 0.0;
    add = add(a, b);//加
    min = t.min(a, b);//减
    mul = t.min(a, b);//乘
    div = t.div(a, b);//除
    System.out.println("add=" + add);
    System.out.println("min=" + min);
    System.out.println("mul=" + mul);
    System.out.println("div=" + div);
}

}
/*
add=17
min=7
mul=7
div=2.4
*/