How to write if statement in java

The if statement has four usage forms:

if(boolean类型表达式){…}
if(条件){…}else{…}
if(条件){…}else if(条件){…}else{…}
if(条件){ if(条件){…} } else {…}

1: if (boolean type expression){…}

Example: If the java score is greater than 60, reward a candy

	//简单的if语句：
	//成绩如果大于60   给奖励
	int score = 10;
	if(score>60){
		System.out.println("给颗糖");
	}	

2: if (condition){…}else{…}

Example: If you are a boy, you will always be 18 years old, otherwise you will always be 16 years old.

// 如果是男生   就永远18岁
// 如果是 女生  永远16岁		
char c = '女';
if(c == '男'){// boolean 结果是true  执行if中   否则执行else中的
	System.out.println("永远18岁");
}else{
	System.out.println("永远16岁");
}

Three: if (condition){…}else if (condition){…}else{…}

Example: If the score is greater than 90 then It means excellent. If the score is greater than 80, it means good. If the score is greater than 70, it means average. If the score is greater than 60, it means passing. If the score is not greater than 60, it means you want to be beaten...

	int score = 50;
		if(score>90){
			System.out.println("优秀");
		}else if(score>80){
			System.out.println("良好");
		}else if(score>70){
			System.out.println("中等");
		}else if(score>60){
			System.out.println("及格");
		}else{
			System.out.println("要挨揍类...");
		}

Four: if (condition) { if (condition) {…} } else {…}

Example: If the score is greater than 90, if it is a boy, give him a girlfriend, if he is a girl, give him a girlfriend Boyfriend

	// 如果成绩大于90   如果是男生    如果是女生
		int score = 10;
		if(score>90){
			if(c=='男'){
				System.out.println("给送个女朋友");
			}else{
				System.out.println("给送个男朋友");
			}
		}

Recommended tutorial: java introductory tutorial

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