if条件控制语句

版权声明：ByRisonBoy https://blog.csdn.net/Rison_Li/article/details/83152982

1、在if括号填入boolean表达式

public class TestBoolean {
	public static void main(String[] args){
	      int x = 100;
	      if( x < 200 ){ 
	         System.out.print("boolean测试");
	      }
	   }
}

2、在if括号填入boolean类型

public class TestBoolean {
	public static void main(String[] args){
	      int x = 100;
	      if(true){ 
	         System.out.print("boolean测试");
	      }
	   }
}

3、逻辑运算

public static void main(String[] args){
		 if((10 > 5) && (19 > 6)){ //全部条件为true执行
	         System.out.print("&&");
	      }
	   }

public static void main(String[] args){
		 if((10 > 5) || (19 < 6)){ //其中一个为true执行
	         System.out.print("||");
	      }
	   }

4、if/else语句

public static void main(String[] args){
		int x = 10;
	      if( x < 20 ){
	         System.out.print("这是 if 语句");
	      }else{
	         System.out.print("这是 else 语句");
	      }
	}

public static void main(String[] args){
		  int x = 10;
	      if( x == 10 ){
	         System.out.print("Value of X is 10");
	      }else if( x == 10 ){
	         System.out.print("Value of X is 20");
	      }else if( x == 30 ){
	         System.out.print("Value of X is 30");
	      }else{
	         System.out.print("这是 else 语句");
	      }
	}