1.if语句练习.docVIP

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1.if语句练习.doc

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1.if语句练习

The if statement is a conditional branch statement. The syntax of the if statement is either one of these two: if?(booleanExpression)?{????statement?(s)} or if?(booleanExpression)?{????statement?(s)}?else?{????statement?(s)} For example, in the following if statement, the if block will be executed if x is greater than 4. public?class?MainClass?{??public?static?void?main(String[]?args)?{????int?x?=?9;????if?(x??4)?{??????//?statements????}??}} In the following example, the if block will be executed if a is greater than 3. Otherwise, the else block will be executed. public?class?MainClass?{??public?static?void?main(String[]?args)?{????int?a?=?3;????if?(a??3)?{??????//?statements????}?else?{??????//?statements????}??}} If there are multiple selections, you can also use if with a series of else statements if?(booleanExpression1)?{????//?statements}?else?if?(booleanExpression2)?{????//?statements}...else?{????//?statements} For example: public?class?MainClass?{??public?static?void?main(String[]?args)?{????int?a?=?0;????if?(a?==?1)?{??????System.out.println(one);????}?else?if?(a?==?2)?{??????System.out.println(two);????}?else?if?(a?==?3)?{??????System.out.println(three);????}?else?{??????System.out.println(invalid);????}??}} public?class?MainClass?{??public?static?void?main(String[]?arg)?{????int?a?=?0;????if?(a?==?0)?{??????System.out.println(a?is?0);????}??}} public?class?MainClass?{??public?static?void?main(String[]?arg)?{????int?a?=?0;????if?(a?==?0)?{??????System.out.println(in?the?block);??????System.out.println(in?the?block);????}?else?{??????System.out.println(a?is?not?0);????}??}} public?class?MainClass?{??public?static?void?main(String[]?arg)?{????int?a?=?2;????if?(a?==?0)?{??????System.out.println(in?the?block);??????if?(a?==?2)?{????????System.out.println(a?is?0);??????}?else?{????????System.out.println(a?is?not?2);??????}????}?else?{??????System.out.println(a?is?not?0);????}?