int i=10;
if(i==10){
System.out.println(i);
}
双选择结构if判断
int i=10;
if(i>10){
System.out.println("正确");
}else{
System.out.println("错误");
}
多重选择结构if判断
//根据成绩的分数来分等级
Scanner scanner=new Scanner(System.in);
int chengji=scanner.nextInt();
if (chengji==100){
System.out.println("成绩满分");
}else if (chengji<100 &&chengji>=90){
System.out.println("优秀");
}else if (chengji<90 &&chengji>=80){
System.out.println("优良");
}else if (chengji<80 &&chengji>=70){
System.out.println("良好");
}else if (chengji<70 &&chengji>=60){
System.out.println("及格");
}else if (chengji<60 &&chengji>=0){
System.out.println("不及格");
}else {
System.out.println("成绩不合法");
}